The first group is our basic boilers. They are the least efficient and usually the least expensive.

The second category is premium units. They are a little more efficient (up to 89% AFUE) but they are more expensive.

The last group is for ultimate units which are commonly called condensing boilers. These units have an AFUE of 90% or more but are also usually the most expensive.

Top Basic Boiler:

The BS2 boilers from Bryant receive our highest recommendation. The brand is a part of United Technologies and these units are a part of their LEGACY LINE. They feature durable cast iron construction and stainless steel/titanium burners. They are compact and have a built in vent damper for energy savings.

 Best Premium Boiler: 

The top honors for premium boilers goes to the BW3 models from Bryant. They feature durable construction and a very good warranty. The brand is a part of UNITED TECHNOLOGIES and are available in the USA and Canada but only through their factory authorized dealer network.

 World's Ultimate Boiler: 

The ultimate gas fired boiler is the Logamax Plus GB142 from Buderus which is a part of Bosch Thermotechnology. The unit has advanced modulating controls with outdoor reset function for added energy savings. The unit is very quiet and is available in four sizes to match the needs of any home. The unit is also ready to be connected to an indirect water heater to produce the home's domestic hot water. 

 Other Boiler ratings

We continue our boiler ratings with an alphabetical list of manufacturers and reviews of their products. You can continue to browse our list but, if you are looking for a specific brand, you can enter its name in the search box at the top of the page.

BRAND--------BASIC-PREMIUM-ULTIMATE

ATH-----------------NA-------NA-------<1*

ADVANCED THERMAL HYDRONICS is a part of MESTEK. The KN2 boilers are floor-standing cast iron boilers with the ability to modulate the output from 40,000 to 200,000 btu/hr. This may be too big for newer homes and the brand is only available through their limited dealer network.

AUER----------------NA-------NA------<1* 

This brand is made in France. The PULSATOIRE units are floor standing high efficiency boilers with electronic controls. Their website is not much help and does not have a stated guarantee for their products. 

BAYMAK-------------NA-------NA------<1* 

This brand is a part of BDR THERMEA and is made and sold in Turkey. They feature wall-hung modulating boilers but their website is not much help and the warranty on the units (especially the heat exchanger) is not very good. 

BERETTA-------NA--------1*--------<1* 

The NOVELLA models are premium boilers with a durable cast iron heat exchanger and electronic ignition. The brand is available in Europe, China, & South America but their website does not have a stated guarantee for their products. 

BOSCH---------------NA-------NA-------5* 

The GREENSTAR range offers five sizes of modulating wall-hung or floor standing boilers. They have a three speed pump and weather compensated control for added energy savings. They are backed by a very good guarantee but are only available through their approved contractor network.

BRADFORD WHITE--<1*------NA------<1*

The BRUTE MINI series of boilers are basic units with two stage control and a copper heat exchanger. The condensing models are wall-hung modulating boilers. The warranty on the units is not very good when compare to other brands. 

BRYANT---------------5*-------5*-------3* 

This brand is a part of UNITED TECHNOLOGIES CORP and is available in the USA and Canada but only through their authorized dealers. The PREFERRED SERIES BW3A units are induced draft units for easier installation and a little higher efficiency than the LEGACY line. They are made of cast iron and have durable stainless steel/titanium burners. They are for water systems only and are backed by a good guarantee. The PREFERRED SERIES BW9 have an efficiency of up to 90% and can be vented with pvc pipe for ease of installation. They have a cast aluminum heat exchanger which is lighter and more energy efficient as well as stainless steel/titanium composite burners for durability. The BWM units are high efficiency modulating/condensing boilers and have an efficiency of 96%. They have a durable stainless steel heat exchanger but the warranty is not as good as some of the other brands. 

BUDERUS-------------2*-------3*-------5* 

This brand is from BOSCH THERMOTECHNOLOGY CORP. The LOGANO G334X is an atmospheric model with an 86% fuel efficiency and durable stainless steel burner but the warranty is not as good as many brands. The LOGANO GA124 model uses sealed combustion and features their aquasmart control but their guarantee is not as good as some of the other brands in the premium category. The GC144 models are designed for replacing old boilers and are available in three sizes.  The LOGAMAX PLUS GB142 units are condensing and have efficiencies up to 95%. They are wall hung units with modulating controls and they are available in four sizes. They offer flexible venting as they can be vented in an existing chimney or direct vented. The warranty on the high efficiency boilers is very good but they are only available through authorized Bosch contractors in the USA.

BURNHAM-----------2*--------3*------<1* 

This brand is from U.S. BOILER COMPANY and is available through dealers in the USA. The SERIES 2 models are basic low cost units but the warranty on parts (other than the heat exchanger) is not very good. The ESC models are premium boilers that can be direct or power vented. They feature the IQ Control system which is an advanced boiler control with a touchscreen interface. The ALPINE units are high efficiency units that are available in seven sizes to match the size of your home. They have a durable stainless steel heat exchanger, advanced control system and are available in floor standing or wall mount models. The warranty (especially on the heat exchanger) is not as good as many brands. 

CAMUS---------------NA-------1*------<1* 

These boilers are made in Canada and is available internationally through distributors. The DYNAPAC SERIES combine a high efficiency boiler with a hydronic air handler to provide domestic hot water, heating and optional cooling. The DYNAMAX SERIES offers high efficiency boilers in either wall or floor mount models. They have modulating control and a durable stainless steel heat exchanger. The MICO FLAME SERIES offers sealed combustion boilers that have a durable ceramic burner. The manufacturer's website is not much help. 

CARRIER--------------5*-------5*-------3*

The COMFORT 80 (BW1 & BW2) units can be used on either water or steam systems. They have an electronic vent damper for energy savings, durable titanium composite burners, and a cast iron heat exchanger. They are available as standing pilot (not recommended) or with electronic ignition for energy savings. The PERFORMANCE 84 SERIES (BW3) units are induced draft units for easier installation and a little higher efficiency than the COMFORT line. They are for water systems only, have a standard intermittent pilot system and are backed by a good guarantee. The PERFORMANCE 96 SERIES (BW9) units have an efficiency of up to 90% and can be vented with pvc pipe for ease of installation. They have a cast aluminum heat exchanger which is lighter and more energy efficient. The brand is a part of UNITED TECHNOLOGIES but their warranty is not as good as some of the brands in the high efficiency category. The units are available in the USA and Canada but only through their authorized dealer network.

CENTROMETAL------NA-------1*-------NA  

This brand is made in Croatia and is sold in Europe. The EKO-CUP M3 units are available in six sizes to match the heating requirements of your home. They are three pass steel boilers but their website does not have a stated guarantee for the units. 

CETIK----------------NA-------1*-------NA  

These units are made in Turkey and are sold worldwide. The EKO SG series features refractory lined heat exchangers and they are available in a wide range of sizes. Their website is not much help and does not have a stated guarantee for their products. 

COSMOGAS---------NA-------NA------<1* 

These high efficiency boilers are made in Italy. The MYdens C units are wall-mounted and feature modulating controls with outdoor reset control for added energy savings. They have a unique titanium/stainless steel C.R.V. heat exchanger. The guarantee on the units (especially the heat exchanger) is not very good when compared to other brands. 

CROWN------------2*--------3*-------<1* 

This brand is sold exclusively by VELOCITY BOILER WORKS. The ARUBA 4 series features basic atmospheric boilers that are made of cast iron. Their draft diverter is mounted on the back of the unit which allows for a more compact unit and more installation flexibility. The BALI series units are induced draft which allows hem to be vented out of a side wall so that a conventional chimney is not required. The BIMINI is a high efficiency unit with efficiencies of up to 95%. It is a fully modulating gas boiler that is available in six sizes and features a cast aluminum heat exchanger. It offers domestic hot water priority for hot showers and an outdoor reset control for energy savings. The SHADOW ultimate boiler features a touchscreen interface and durable stainless steel heat exchangers. It is a wall-mounted unit that has dhw priority to ensure that you do not run out of hot water for domestic uses. The RAPTOR model features a combustion efficiency of up to 95% and is available in five sizes. The warranty on this brand (especially on parts other than the heat exchangers) is not as good as many other brands and they are only available through their limited contractor network. 

DE DIETRICH--------NA-------1*------<1* 

This brand is a part of GROUP BDR THERMEA and is available in Europe and North America. The GT series features three pass cast iron boilers that are available in five sizes to match the size of the home. They can be vented through a chimney or by direct vent for flexibility in installation. The MCA Pro Series offers wall-hung condensing/modulating boilers in three sizes. They have a durable stainless steel premix burner but the warranty on the units is not very good. 

DEMIRDOKUM-------NA-------1*------<1* 

This brand is made in Turkey and is a part of the VAILLANT GROUP. They offer a variety of wall-hung boilers but their website is not much help and does not have a stated guarantee for their products. 

DUNKIRK----------1*---------2*-------<1* 

This brand is from ECR INTERNATIONAL and is available in the USA but only through a limited dealer network. The DXL SERIES offers cast iron atmospheric type units with basic features. The XEB series are compact cast iron units with titanium burners for durability and induced combustion. The HELIX VLT is a high efficiency (96%) wall hung boiler with built in outdoor reset temperature control for enhanced energy savings. The unit's self-cleaning design and stainless steel heat exchangers ensure long life and continued efficiency. The Q95M-200 model is a floor-standing, modulating, condensing boiler with an AFUE of 95%. The warranty on this brand (especially the heat exchanger) is not very good when compared to other brands. 

DYNATHERM----------NA-------1*-------NA

The FP series boilers are available in three sizes for homes but their website is not much help. The guarantee on the heat exchanger is very good but the rest of the parts is not.

ECO KING-----------NA-------NA------<1* 

The SUPREME boilers are made by DAALDEROP and are distributed throughout North America by KING HEATING PRODUCTS INC. They are wall mounted modulating high efficiency boilers that feature durable stainless steel heat exchangers and an integrated variable speed pump and expansion tank. They have an outdoor reset control for added energy savings but the warranty is not as good as other brands. ecokingheating.com

ELCO--------------NA--------NA-------<1*

This brand is a part of ARISTON THERMO S.p.A. and offers both floor standing and wall mounted boilers. The THISION S model is a wall-mounted modulating boiler. The warranty on the units (especially the heat exchanger) is not very good. 

EMBASSY-----------NA--------NA--------1* 

This brand is a part of MESTEK and is available in North America and Europe. The ONEX units are wall-hung high efficiency boilers. They have durable stainless steel heat exchangers and modulating controls to closely match the heating requirements of the home. The units have a durable stainless steel heat exchanger but the warranty on the other parts is not very good when compared to other brands. 

EMMETI------------NA--------NA-------<1* 

These boilers are made and sold in Italy. The ALTHEA is a wall-hung condensing modulating boiler but their website is not much help and does not have a stated guarantee for their products. 

ESKABE------------1*--------1*---------NA 

This brand is made and sold in Argentina. They offer wall hung units that use digital modulating controls and have durable copper/stainless steel heat exchangers. The TNC models are natural draft (atmospheric) units that are available in three sizes while the TBFC are induced draft units and are available in two sizes. The manufacturer's website is not much help and does not have a stated warranty policy. 

FLEETLINE---------NA--------2*--------NA 

These boilers are made in Canada by BRANT STEEL PRODUCTS LTD. The AQUA-MATIC units have a ceramic fiber fire chamber for durability and are multi-firing to closely match the heat requirements of the home. The F-SERIES models have a built-in domestic hot water coil. All of the units have an 89% efficiency due to internal stainless steel baffles but the warranty on the units is not as good as many other brands. 

FONDITAL--------<1*--------NA-------<1* 

The BALI range offers basic cast iron floor standing boilers that feature a durable stainless steel burner but their guarantee is not very good and they are only for export to countries outside of the EU. The FORMENTERA KR is a wall-hung condensing boiler with modulating fan and gas valve. They have a durable stainless steel heat exchanger but their guarantee is not very good when compared to other brands. 

FRISQUET---------NA--------NA-------<1* 

This brand is from CHILLY SA and is sold in France. The HYDROMOTRIX is a wall-hung boiler while the PRESTIGE line features floor standing units. Their website is not much help and their guarantee is not very good when compared to other brands.

HARREITHER------NA--------NA-------<1* 

The MULTI STAR range of boilers offers condensing boilers that provide domestic hot water as well as central heating. They feature electronic controls but the manufacturer's website is not much help and does not have a stated guarantee for their products. The units are made in Austria and sold throughout Europe. 

HTP----------------NA--------NA-------<1* 

The ELITE units are available in either floor or wall mounted models and have a combustion efficiency of up to 98%. They have "Total System Control" which is an advanced monitoring and control system. The boilers have a durable stainless steel heat exchanger but their warranty (especially on the heat exchanger) is not as good as most brands. The PIONEER units are high efficiency boilers that are designed to replace old cast iron boilers with a large thermal mass. The UFT models is a medium mass high efficiency boiler that has a state of the art gas leakage detection system as well as ultra low NOx emissions. The brand is available in the USA and Canada but only through their authorized dealer network.

IBC----------------NA--------NA-------<1* 

The VFC 15-150 is a wall-mounted condensing, modulating boiler. It features a stainless steel heat exchanger for durability and can be vented with pvc pipe which is quicker and less expensive. The unit has onboard switching for up to four pumps and/or zone valves and a state of the art touchscreen boiler control. The HC SERIES offers boilers with a copper heat exchanger for corrosion resistance as well as a built-in pump and outdoor reset temperature control. The units are made in Canada and sold throughout North America but the warranty is not as good as many brands. 

INTERCAL---------NA--------NA-------<1* 

This brand is part of the MHG GROUP. The RATIOLINE models are floor-standing models that are designed for replacement applications. Their website is not much help and does not have a stated warranty policy for the units.

JOHNSON & STARLEY--NA--NA-------<1*  

These boilers are made and sold in the U.K. The QUANTEC models feature condensing/modulating controls and durable stainless steel heat exchangers. Their website is not much help and does not have a stated warranty policy for the units.   

KERR---------------NA--------3*--------NA 

This brand is manufactured in Canada by PARRSBORO METAL FABRICATORS LIMITED. The Calisto units have an AFUE of up to 87% but their website is not much help. The brand is sold in Canada but only through authorized installers.

KNIGHT------------NA--------NA-------<1* 

This brand is from LOCHINVAR and is available in floor standing or wall mounted units. It has an AFUE of 93% and can be direct vented with PVC pipe up to 100 feet. The units have "SMART SYSTEM' control which is a digital operating control and includes a night setback function as well as outdoor reset control for energy savings. The standard warranty is not very good and the units are only available through authorized contractors in the USA. 

KOMBI--------------NA--------1*--------NA 

These boilers are made in Greece by THERMODYNAMIKI and are sold throughout Europe. The SB models have an onboard four speed pump but their website is not much help and does not have a stated guarantee for their products. 

KROLL------------NA--------NA-------<1*  

These boilers are made in Germany and are available worldwide. They offer two stage condensing boilers with weather compensated control for added energy savings. Their website is not much help and does not have a stated guarantee for their products. 

LAARS--------------1*--------1*-------<1* 

This brand is owned by BRADFORD WHITE. The MINITHERM is a basic atmospheric combustion model but the warranty is not as good as most other brands. The NEOTHERM HB is a high efficiency (95%) modulating boiler with electronic proportional control. It features a large interface and display and a stainless steel heat exchanger and burner for durability. The MASCOT LX range offers seven sizes of high efficiency wall-hung boilers. They feature a quiet variable speed blower and full modulating capability but the warranty on the brand is not very good when compared to others.

LADOGAZ---------NA--------1*--------NA  

These boilers are made in Russia and are also sold in Kazakhstan & Kyrgyzystan. They offer wall-hung or floor standing units that feature durable copper heat exchangers but the warranty is not very good when compared to other brands. 

LAMBORGHINI----NA--------NA-------<1* 

This brand offers a variety of models but their website is not much help and does not have a stated guarantee for their products. 

LENNOX-------------1*--------2*--------3* 

The GWB8-E units are basic cast iron units that are available in nine different sizes to match the heating requirements of virtually any home but the standard warranty is not as good as many other brands. They have stainless steel burners for durability and an automatic vent damper for energy savings. The GWB8-IE series units use sealed combustion for higher operating efficiency but the standard warranty is not as good as many other brands. They are available in six sizes to match the heating requirements of your home. The GWM-IE units are condensing boilers with the ability to modulate their capacity to closely match the heating needs of the home. They have stainless steel burners and heat exchangers for durability and are backed by a pretty good warranty. The units are available in the USA and Canada but only through their dealer network.

LOCHINVAR-------NA---------1*-------<1* 

The SOLUTION series offers two stage boilers with stainless steel burners, copper tube heat exchanger, and a ceramic tile combustion chamber for durability. The units can be vented through pvc pipe with an optional kit that includes an inducer motor. The CADET models are compact wall-hung modulating boilers. They have outdoor reset control for added energy savings but the warranty on the heat exchanger is not very good. The brand is available worldwide but only through their sales representatives.

MAIN-------------NA---------NA-------<1* 

These boilers are made and sold in the U.K. through authorized installersThe HE A is a wall-hung condensing boiler that is available in five sizes but the guarantee on the heat exchanger is not very good when compared to other brands. The brand is from BAXI which is a part of BDR THERMEA. 

NEW YORKER-----2*---------3*--------NA

This brand is a subsidiary of BURNHAM HOLDINGS INC. and is available through dealers in parts of the USA. The CG-D series offers cast iron atmospheric boilers in four sizes. They have intermittent pilots and automatic vent dampers for added efficiency but the warranty is not as good as many brands. The PVCG units are induced draft boilers that can be direct vented so a conventional chimney is not required but the warranty is not as good as some other brands. 

NTI-----------------NA--------NA--------5* 

These boilers are made in Canada by NY THERMAL INC. The TRINITY LX models have an efficiency of up to 97% and can be wall or floor mounted. They use touchscreen controls for ease of operation and use modulation to closely match the heat loss of the home. They have a durable stainless steel heat exchanger that is backed by a very good warranty. 

OROFLAM----------NA--------1*-------<1* 

This brand is made in Italy and offers sealed combustion boilers for either internal or external installation. The ORK model boilers are available in  three sizes but their website is not much help. 

PEERLESS----------2*--------3*-------<1* 

The MIH series of units are basic boilers with durable cast iron construction and a low profile design. They use spark to pilot ignition which can lead to more maintenance and repairs. The DE models are sealed units that can be vented with or without a normal chimney. The PUREFIRE series are condensing modulating boilers with an AFUE of up to 96% and a unique condensate management system. They are available in six sizes and feature durable stainless steel construction but the warranty on parts other than the heat exchanger is not very good. The units are available in the USA and Canada but only through their installer network.

PENNCO----------1*--------1*---------<1* 

This brand is from ECR INTERNATIONAL but is only available through a limited dealer network in the USA. The 15B SERIES II models are atmospheric boilers that are available in nine sizes to match most any home's heating needs. They have a built-in vent damper control for energy savings. The FSB series are cast iron induced draft models and are available in six sizes. Both models have all of the basic features but the warranty is not very good. The P90 is a high efficiency boiler but does not have many of the latest features and the guarantee on the unit is not very good when compared to other brands. 

PENNSOTTI----------NA--------1-------<1* 

This brand is a part of GRANBY INDUSTRIES and is available through authorized dealers in Canada. The DK2 units are basic three pass cast iron boilers that can be vented into an existing chimney or direct vented. The SOLENNE CONDENSING SERIES offers wall-hung high efficiency boilers but the warranty on the brand is not very good compared to others.

RAYPAK-------------1*--------1*-------<1*

This brand is from RHEEM MANUFACTURING which is a part of the PALOMA GROUP.

The RAYTHERM series features atmospheric boilers that use spark to pilot ignition which can lead to more maintenance and repairs. The HI DELTA units use sealed combustion and direct hot surface ignition. They are two stage units with an efficiency of about 84%. The XPAK model is a wall hung modulating, condensing boiler with a built-in three speed circulator pump and outdoor reset control for added energy savings. The warranty on the brand is just not very good. 

RIMA---------------NA--------1*--------NA  

The RS SERIES offers three pass cast iron boilers with automatic electronic controls. The brand is from ONMETAL and is made in Turkey but their website is not much help. 

RINNAI------------NA--------NA-------<1* 

This brand offers high efficiency wall-mounted boilers. They have a modulating pump for higher efficiency and a stainless steel heat exchanger for durability. They are sold through dealers but the warranty on parts (except the heat exchanger) is not as good as many brands. 

ROTEX-------------NA--------NA-------<1* 

The GCU is made in Germany and is sold throughout Europe. It is available in four sizes and integrates a built-in storage tank for heating and domestic hot water production. The built-in digital programmer compensates for the outdoor temperature for added energy savings and the boiler is fully modulating. The GW units are condensing/modulating boilers with advanced digital controls that allow for weekly programming. Their website is not much help and does not have a stated warranty policy. Rotex is a part of the DAIKIN GROUP. 

SIME----------------NA-------NA-------<1* 

 The PLANET DEWEY units are wall-hung condensing/modulating boilers with a 97% efficiency. They feature durable stainless steel heat exchangers and have a built-in circulator, expansion tank, and air eliminator for ease of installation. The warranty (especially on the heat exchanger) is not as good as many other brands. 

SLANT/FIN------------2*-------3*-------2* 

The SENTINEL SE series units are basic models and the VICTORY VSPH series units are sealed combustion units. Both of them use spark to pilot ignition which can require more maintenance and repairs. The CHS boilers are condensing & modulating units that are available in eight sizes to match the needs of your home. They have durable stainless steel heat exchangers and outdoor reset temperature control for energy savings as well as a decent warranty. The brand is available in the USA but only through their authorized dealer network.

STREBEL---------<1*-------<1*-------<1*

This brand is made in Austria and is available in Europe. EC units are basic atmospheric boilers while the CAT models have inducer fans. The VICTRIX is a wall-hung condensing/modulating boiler. Their website is not much help and does not have a stated warranty policy. 

SUPER HOT--------1*--------NA-------<1* 

This brand is from ALLIED BOILERS which is a division of E-Z-RECT MANUFACTURING LTD. The units are made in Canada. The MINI-GAS series units are atmospheric combustion units that feature a double pass steel finned tube heat exchanger and stainless steel burners. The HSE models are high efficiency modulating units that are wall mounted. They have electronic controls with outdoor reset control for added energy savings. The warranty on this brand is not very good when compared to most other brands. 

SYSTEM 2000--------3*-------4*-------NA 

The EK1 FRONTIER models are available in sizes from 85000 to 121000 btu/hr through dealers. The system includes a 40 gallon domestic hot water (dhw) storage tank and a stainless steel dhw coil. The units use a digital energy manager and can supply hot water to up to 15 different zones. The units feature a patented spiral tube boiler to increase efficiency and are backed by a pretty good warranty. 

TERMET--------------NA-------NA------<1* 

These boilers are made in Poland and are sold throughout Europe. The ECOCONDENS CRYSTAL II is a high efficiency wall-hung boiler with a durable stainless steel heat exchanger. They are available in three sizes but their website is not much help and does not have a stated warranty policy.   

TERMODINAMIK----NA-------NA------<1* 

This brand is made and sold in Turkey but only through their authorized dealer network. The ECS series is available in a wide variety of sizes to match the needs of your home. They feature variable speed pumps, an optional timer, and optional domestic hot water production. The manufacturer's website is not much help and the guarantee on the heat exchanger is not very good.

THERMO-DYNAMICS--NA-------3*------NA 

The CWL series offers three sizes of boilers with all of the standard features. They are made in the USA and backed by a decent warranty but their dealer network is mostly in the northeast part of the USA. 

THERMOFLO---------2*-------3*-----<1*

This brand offers a wide variety of boilers that are made of cast iron. They have stainless steel burners for durability and a built-in air separator to keep air out of the system.The FREESTYLE model is a wall-mounted condensing boiler with modulating ability. They feature a durable stainless steel heat exchanger and are available in three sizes. The warranty on the heat exchanger is good but the guarantee on most other parts is not as good as other brands. The GWA model is a basic boiler that uses atmospheric combustion. It has a large external draft diverter which takes up added space but it has a built-in air separator. The GWI models use a draft inducer which allows for sidewall or chimney venting for flexibility. The brand is available in the USA but only through their factory authorized distributors.

THERMOSTAHL-------NA-------1*-------NA 

The ENERSAVE PLUS units are low temperature three pass boilers that are available in a wide selection of sizes. The warranty on the units is not very good when compared to other brands. 

TriangleTube---------NA-------NA------<1* 

The PRESTIGE ACVMax series units are high efficiency wall mounted units. They are fully modulating and have a combustion efficiency of up to 95% for energy savings. The CHALLENGER SOLO is a high efficiency wall-mounted boiler that has a unique insert cast iron heat exchanger. It has outdoor reset temperature control for added savings but the manufacturer's website is very little help and does not have a stated warranty policy. The brand is only available through their limited dealer network in the USA.

TRIO----------------NA-------3*-------NA

This brand is from PUREPRO PRODUCTS and is available exclusively through F.W. WEBB COMPANY a distributor of HVAC and plumbing supplies in nine states in the northeast part of the USA. The boiler bodies are made by BOYERTOWN FURNACE and feature durable cast iron construction. They are three pass low mass boilers that use recirculating flue gas technology for increased efficiency. They can be direct vented for convenient installation and are backed by a pretty good guarantee. 

UNICAL--------------NA-------1*------<1* 

These boilers are made in Italy. They feature cast iron construction and electronic controls but their website is not much help and does not have a stated guarantee for their products. The IDEA range offers standard efficiency wall-hung units while the KON model is a high efficiency boiler. 

UTICA---------------2*-------3*-------<1* 

This brand is from ECR INTERNATIONAL and is sold through authorized dealers in the USA and Canada. They offer a wide selection of units with a good warranty. The MGB/MGC series are basic atmospheric boilers with an automatic vent damper for energy savings. The SVB SERIES II models are premium units with durable cast iron heat exchangers. The SSC model is a wall-hung condensing/modulating boiler that is low maintenance and self cleaning but its warranty is not very good. 

VAILLANT------------1*-------1*--------NA 

The atmoVIT units have a two step burner and an integral draft diverter with automatic damper. The atmoTEC units are wall-hung sealed units. Their website is not much help and does not have a stated guarantee for the units. 

VIADRUS-----------1*--------1*-------<1* 

This brand is available in Europe as well as the USA but only through authorized dealers. The CLAUDIUS models have continuous output modulation and up to three independent heating zones. The G36 units are atmospheric burning units with a cast iron body. Both types have "equithermic adjusting" where the boiler temperature is adjusted based on the outdoor temperature. The K4 boilers are high efficiency wall-hung units with durable stainless steel heat exchangers but the guarantee is not very good when compared to other brands.

VIESSMANN---------1*-------2*------<1* 

The VITODENS models are high efficiency wall mounted condensing boilers with an efficiency of up to 95%. They have a three speed pump and modulating control for ultimate energy savings. The burner and heat exchanger are made of stainless steel for durability but the warranty is not as good as many brands in the category. The brand is available through a limited dealer network in the USA.

WEIL-MCLAIN--------2*-------3*-------2*  

This brand offers a wide selection of units to match your needs. The EVERGREEN gas boilers are condensing/modulating units that can be floor standing or wall-mounted. They are available in three sizes and feature a durable stainless steel heat exchanger but its warranty is not very good when compared to other brands. The ULTRA SERIES 3 units are condensing modulating units with a good warranty. The GV90+ series of units are condensing boilers that are available in four sizes to match the requirements of the home. They have built in dual circulators and can be vented with pvc pipe but the warranty is not as good as many other brands. They receive a 1* rating in the high efficiency category. The WM97+ models are high efficiency wall hung models with durable stainless steel heat exchangers. The CGi units are direct vent sealed combustion models that are available in eight sizes but the warranty is not as good as many other brands. The CGa units are basic atmospheric models. They have stainless steel burners but the warranty on the units is not as good as many other brands. The ECO models are available in three sizes and have an efficiency of 95%.

WESTINGHOUSE----NA-------NA------<1*

These boilers are made by HT PRODUCTS INC. but their warranty is not very good when compared to other brands. The PREMIER high efficiency unit can be floor standing or wall mounted and is available in seven sizes to match the needs of virtually any home. Their FIRE TUBE BOILER is the next generation in boilers and is a wall hung unit. It has a durable stainless steel heat exchanger and modulating ability with an outdoor reset temperature control for added energy savings. 

WILLIAMSON--------1*-------1*------<1* 

This brand offers a wide variety of boilers that are made of cast iron. They have stainless steel burners for durability and a built-in air separator to keep air out of the system. The FREESTYLE model is a wall-mounted condensing boiler with modulating ability. They feature a durable stainless steel heat exchanger and are available in three sizes. The warranty on the heat exchanger is good but the guarantee on most other parts is not as good as other brands. The GWA model is a basic boiler that uses atmospheric combustion. It has a large external draft diverter which takes up added space but it has a built-in air separator. The GWI models use a draft inducer which allows for sidewall or chimney venting for flexibility. The brand is available in the USA but only through their factory authorized distributors.

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The FNG models are floor standing premium gas boilers with stainless steel pre-mix burners and the CGB-2 are wall mounted condensing boilers. Their website is not much help and does not have a stated guarantee for their products. The brand is a part of CENTROTEC AG. 

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This brand offers a wide selection of models and is available worldwide but their dealer network is limited. The FLORENCA wall boiler is available in both high temperature and low temperature versions. They have built-in pumps and three independent heating circuits. Their website does not have a stated warranty policy.