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With our combi boiler ratings, you can cut through all of the sales hype and find the greatest value. We search the technical literature and use our heating system service experience to create our unique rating system. It truly is like taking a repairman with you while you shop! These ratings are for gas-fired boilers that provide hot water for central heating as well as for showers, etc.
Our top pick is the ECOGEN from BAXI. It is one of the most innovative direct combi boilers on the market. It is a micro-chp unit as well as a high efficiency heating system. Installation is basically the same as a traditional boiler but this unit produces up to 1 kilowatt of electricity at the same time. baxi.co.uk
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We continue our combi boiler ratings with an alphabetical list of manufacturers and reviews of their products.
BRAND---------DIRECT-STORAGE-SYSTEM
AIRFEL------------<1*--------NA--------NA
This brand is a part of DAIKIN GLOBAL and is made in Turkey. The DIGIFEL models are available in two sizes and have a digital LCD display control panel. The models have automatic air purgers, circulation pump exercising, and three way valve exercising for reliable operation. The units have durable stainless steel heat exchangers but the warranty on the units is not very good. airfel.com.tr
ALARKO----------<1*--------NA--------NA
This brand is made and sold in Turkey. The SERADENS models are available in three sizes and feature full modulation with a LCD digital control panel. They have stainless steel heat exchangers for durability but the warranty on the units is not as good as many other brands. alarko-carrier.com.tr
ALPHA------------<1*--------NA--------3*
This brand is a subsidiary of IMMERGAS and is available in the U.K. The InTEC2 CE model is a direct combi that is available in three sizes but the warranty is not as good as some other brands. The InTec2 X model is their "entry level" direct combi and its warranty is even worse (it gets a <1* rating). The Intec2 SE is a system unit that requires an optional diverter kit for domestic hot water priority but it is backed by a good warranty. All of the units use durable stainless steel heat exchangers. alpha-innovation.co.uk
ACV---------------NA-------<1*-------<1*
These units use tank-in-tank technology where a stainless steel tank is inside of another tank. This provides a lot of surface area for heat transfer and therefore rapid recovery. The units have advanced programmable controls that are internet ready for maximum flexibility. The HEATMASTER series are floor standing units and the PRESTIGE EXCELLENCE series are wall hung units. The PRESTIGE SOLO series units are wall hung system boilers. The guarantee on these units is not very good when compared to other brands. acv.com
ARCA-------------<1*--------NA-------<1*
This brand is made in Italy and is available in Europe. The ECOFAST models feature outside temperature controls (OTC). The PIXEL C is a condensing boiler that is designed to be used with an external storage tank. The manufacturer's website is very little help and does not have a stated warranty policy. arcacaldaie.com
ARGO------------<1*--------NA--------NA
These boilers are made and sold in Italy. Their website is not much help and does not have a stated guarantee for the products. argoclima.com
ARISTON---------<1*-------NA-------<1*
This brand is a part of the MTS GROUP and is available in the U.K. The GENUS PREMIUM EVO units have modulating pumps as well as gas controls for energy savings. They are available in both direct combi and system configurations but their website is not much help and does not have a stated warranty policy. aristonheating.com
AR THERM--------<1*--------NA--------NA
The BLUE direct combi units are high efficiency units but the warranty is not as good as some other brands. The boilers are made in Italy and sold in Europe and Russia. ar-therm.com
ATTACK-----------<1*-------<1*-------<1*
These boilers are made in Slovakia and are sold throughout Europe. The KST PLUS is a direct combi with a durable ceramic mixing burner and electronic controls. The KZT PLUS is a storage cobi with two pumps and a two liter tank while the COMPACT PLUS is a system boiler. Their website is not much help and does not have a stated guarantee for their products. attack.sk
AWB--------------<1*--------NA-------<1*
This brand is a part of the VAILLANT GROUP and is available through dealers in the Netherlands. The THERMO ELEGANCE ADVANCE boilers are available in four sizes and feature durable stainless steel heat exchangers. awb.nl
BAXI---------------5*--------NA-------<1*
The MEGAFLO series are system boilers that are available in five sizes. This brand is distributed in North America by MARATHON INTERNATIONAL (wallhungboiler.com). The ECOGEN is one of the most innovative direct combi boilers on the market. It is a micro-chp unit as well as a high efficiency heating system. Installation is basically the same as a traditional boiler but this unit produces up to 1 kilowatt of electricity at the same time. The ECOBLUE ADVANCE boilers feature an industry leading warranty for 2015. baxi.co.uk
BAYMAK----------<1*--------NA--------NA
This brand is a part of BDR THERMEA and is made and sold in Turkey. Their website is not much help and the warranty on the units is not very good when compared to other brands. baymak.com.tr
BERETTA---------<1*-------<1*-------<1*
These boilers are available in Europe, China, and South America. They offer a wide selection of models but their website is not much help and does not have a stated guarantee for their products. berettaboilers.com
BIASI-------------<1*--------NA--------NA
The RIVA ADVANCE HE units are available in only two outputs (27.3 & 35.7kw). They have a 24 hour/7 day programmer. The guarantee on the units is not very good. biasi.co.uk
BOSCH-------------4*--------NA--------NA
The GREENSTAR COMBI range offers three sizes of units. They have an onboard three speed pump and modulating controls. They offer both wall-hung and floor standing models that are backed by a good warranty. bosch-climate.us
BROTJE----------<1*-------<1*--------NA
This brand is a part of BAXI GROUP. Their ECO THERM PLUS units are available in direct or storage models. Although the guarantee on other parts is pretty good the guarantee on the heat exchanger is not when compared to other brands. broetje.de
BUDERUS----------NA--------NA-------<1*
This brand is a part of the BOSCH GROUP. The GB142 have advanced modulating controls but the warranty is not very good when compared to other brands. buderus.net
BULEX------------<1*--------NA-------<1*
This brand is a part of the VAILLANT GROUP and is available in Belgium. The THERMO MASTER units are available in direct combi or system models. They are basic units with a warranty that is not very good when compared to other brands. renovabulex.be
BUTANE----------<1*-------<1*--------NA
This brand is made in Iran and is available in Europe and Asia. They offer a variety of units with your basic features but their website is not much help and does not have a stated warranty policy. The NUOVA ACQUA units feature a 60 liter storage tank for larger applications. butaneportal.com
BUVA--------------<1*--------NA--------NA
The ECOHEAT boilers are available in three sizes but their website is not much help. The brand is a part of PALLIETER GROUP but the guarantee is not very good when compared to other brands. buva.nl
CHAUFFAGE FRANCAIS--NA---<1*---<1*
This brand is a part of the RIELLO GROUP and is available in France. The MURAN CONDENS range offers system and storage units that are backed by a good warranty. chauffage-francais.fr
COSMOGAS------<1*-------<1*--------1*
The NOVADENS models are condensing system boilers with a durable stainless steel heat exchanger. The units are wall-mounted and use sealed combustion for energy efficiency. The TOPDENS models are storage combi units while the MYDENS models are direct units with durable & efficient stainless steel plate heat exchangers. cosmogas.com
DAALDEROP-----<1*-------<1*--------NA
This brand is available in the Netherlands but their guarantee is not very good when compared to other brands. The COMFORT CLASSIC boilers are available in five sizes to match the heating needs of the home. They offer two zones for heating. ithodaalderop.nl
DAESUNG CELTIC-<1*-------NA--------NA
The S-Line condensing model offers all of the standard features while the WE-BEST units feature a built-in water softener which is unique. Their website is not much help and does not have a stated warranty policy. celtic.co.kr
DAYLUX-----------<1*--------NA--------NA
These units are made in Turkey and are sold throughout Europe, North Africa, and the Middle East. Their range of products is limited but the units have a durable copper heat exchanger and use modulating control. They have an auto air purge for ease of installation. Their website is not much help and does not have a stated warranty policy. eximet.biz
DE DIETRICH---<1*-------<1*-------<1*
This brand is a part of BDR THERMEA and the units are sold in Europe. The INNOVENS range offers both direct and storage models and are available in sizes from 8 to 35kw. They have iSystem modulating controls but their website is not much help and does not have a stated guarantee for their products. dedietrich-heating.com
DOMUSA----------<1*-------<1*--------NA
This brand is a part of MONDRAGON CORPORATION and the units are made in Spain. The AVANTTIA H models are storage combis that are available in two sizes. The EVOLUTION EV AM is a floor standing direct combi for oil or gas burning. Their website does not have a stated guarantee for their products. domusa.es
ECO HOMETEC---<1*--------NA--------1*
This brand is available in the U.K. and features condensing models with modulating controls. The units have stainless steel heat exchangers for durability and weather compensation controls for increased energy savings. For the direct combi models, the warranty is not as good as many other brands. eco-hometec.co.uk
ECO KING--------<1*--------NA--------NA
The SUPREME boilers are made by DAALDEROP and distributed throughout North America by KING HEATING PRODUCTS INC. They 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 guarantee on the units is not very good when compared to other brands. ecokingheating.com
EMBASSY---------<1*--------NA--------NA
This brand is a part of MESTEK. Their ONEX model features parallel flow stainless steel heat exchangers for durability and efficiency. The units have modulating controls to closely match the heating requirements but the warranty is not very good when compared to other brands. embassyind.com
EMMETI----------<1*--------NA-------<1*
These boilers are made and sold in Italy. The NINA S is available in a direct combi or system model. Their website is not much help and does not have a stated guarantee for their products. emmeti.com
ESKABE----------<1*--------NA--------NA
This brand is made and sold in Argentina. The ACQUAPIU range offers both natural draft (TND) and forced draft units (TBFD). They feature digital modulating controls for efficiency but the manufacturer's website does not have a stated warranty policy. eskabe.com.ar
FERROLI----------<1*--------NA--------3*
This brand is made in Italy and is available throughout Europe. The MODENA HE models are available as combi or system models. They feature durable stainless steel burners and heat exchangers but the guarantee on the direct combi models is not very good when compared to other brands. In the system boiler category, they stack up much better against the competition. ferroli.it
FLOWMAX---------<1*--------NA--------NA
These boilers are made in Canada and are sold throughout North America. The units are available in three sizes but their guarantee (especially on the heat exchangers) is not very good when compared to other brands. flowmaxtechnologies.com
FONDITAL-------<1*-------<1*-------<1*
The ITHACA KB model is a storage combi with a 45 liter tank. The ITHACA direct combi units have touchscreen controls and a durable stainless steel heat exchanger. They also have two independent heating zones and are available in three sizes. Their website does not have a stated warranty policy. fondital.it
FONTECAL-------<1*--------NA-------<1*
The COROLLA model units are made and sold in Italy. They are available in models for outdoor installation as well as indoor. Their website is not much help and does not have a stated guarantee for their products. fontecal.it
FRISQUET--------<1*-------<1*--------NA
This brand is made and sold in France by CHILLY SA. The HYDROMOTRIX models are wall-hung boilers with a durable copper heat exchanger. The PRESTIGE series offers floor standing storage combis. Their website does not have a stated warranty policy. frisquet.fr
GIERSCH---------NA--------<1*--------NA
This brand is a part of the ENERTECH GROUP and is available in Europe. The GIEGASTOR COMPACT is a floor standing unit that uses condensing technology for maximum efficiency. The unit has a 100 liter tank to provide an ample supply of domestic water. It has a stainless steel heat exchanger for durability. The manufacturer's website is not much help and does not have a stated warranty policy. giersch.de
GLOW-WORM------1*--------NA-------<1*
This brand is a part of the VAILLANT GROUP and is available in the U.K. The ENERGY combi is a high efficient boiler with a modulating circulator pump. They are backed by a decent guarantee when installed by a "club energy" installer. glow-worm.co.uk
HARVEST---------<1*--------NA--------NA
These units are sold in Europe, Asia, and South America. They feature electronic modulating control but their website is not much help and does not have a stated guarantee on the boilers. harvest.cn
HEATLINE--------<1*--------NA--------NA
This brand is a division of DD HEATING LTD which is a part of the VAILLANT GROUP and is available in the U.K. and Ireland. The CAPRIZ PLUS units have all of the standard features but the warranty on the boilers is not very good when compared to other brands. heatline.co.uk
HERMANN-------<1*-------<1*-------<1*
This brand is a part of the VAILLANT GROUP and is made in Italy. They are sold in many European countries. They have both indoor and outdoor mounted models available. The SUPERMICRA SB units can be used with either their 100 liter or 150 liter tanks. They have an anti-legionella function where the tank is heated up to 60c every seven days regardless of water usage. The EURA TOP models are mini tank units to provide hot domestic water quickly. hermann-saunierduval.it
HTP-----------------NA--------3*--------4*
The VERSA-FLAME models have a 55 gallon storage tank and electronic controls. They are floor standing units and are backed by a good warranty. The EFT combi units are wall hung system boilers with durable stainless steel heat exchangers. They are backed by a very good guarantee. htproducts.com
HYBRITHERM------NA--------NA--------1*
The SOL SERIES boilers are available in two sizes and are sold in the USA and Canada. They have two circuits for central heating and one for domestic hot water and are backed by a decent guarantee. hybritherm.com
IDEAL---------------5*--------NA--------5*
This brand is from the IDEAL STELRAD GROUP and is available in the U.K. The VOGUE range offers boilers that have all of the standard features and are backed by a very good guarantee. idealboilers.com
IMMERGAS------<1*-------<1*-------<1*
This brand is made in Italy and is available throughout Europe. The VICTRIX SUPERIOR units are direct combi units and are available for either interior or exterior installation. They include a mini reservoir "AQUA CELERIS" which provides immediate dhw flow without the size of a typical storage combi. The VICTRIX ZEUS range is a storage combi with a 54 liter tank. immergas.com
INTELLIHOT------<1*--------NA--------NA
These boilers are made in the USA and feature a self-descaling design and a durable stainless steel heat exchanger. They have a built-in recirculation pump for water conservation and are available in two sizes. The warranty is not very good when compared to some other brands. intellihot.com
INTERCAL--------<1*--------NA-------<1*
The ECOHEAT range offers direct or system combi models. They have integrated weather compensating control and a digital two channel timer. Their website is not much help and does not have a stated guarantee for the boilers. intercal.de
ITALTHERM------<1*-------<1*-------<1*
These boilers are made and sold in Italy. They feature stainless steel plate heat exchangers and multi-speed circulator pumps. They offer both indoor and outdoor units but their website does not have a stated guarantee. The CITY MAX K storage units have a durable stainless steel tank. italtherm.it
JOANNES-----------NA-------<1*--------NA
These boilers are made and sold in Italy by FINTERM. The AGE 28 NES models have electronic controls and a small (4.5 liter) tank. Their website is not much help and does not have a stated warranty policy. joannes.it
JOHNSON & STARLEY-<1*----NA-----<1*
This brand is available in the U.K. The QUANTEC range features durable stainless steel heat exchangers but the guarantee on the units is not very good when compared to other brands. johnsonandstarley.co.uk
KESTON----------<1*--------NA-------<1*
This brand is made and available in the U.K. The COMBI RANGE offers two sizes of direct combi boilers. They have built-in weather compensation and frost protection. The guarantee on the units is not very good when compared to other brands. keston.co.uk
KITURAMI--------<1*--------NA--------NA
This brand is made in Korea and is available in Europe and Asia. The ECO CONDENSING boilers are available in four sizes but the guarantee on the units is not very good when compared to other brands. krb.co.kr
KNIGHT------------NA--------NA-------<1*
This brand is from LOCHINVAR and is widely available. The units have all stainless steel heat exchangers that are backed with a very good warranty. The warranty on the other parts is not good. knightheatingboiler.com
LAARS------------<1*--------NA--------NA
This brand is a part of BRADFORD WHITE CORPORATION. The MASCOT LX is a wall-hung combi boiler with a stainless steel heat exchanger for durability. It has a variable speed fan but the guarantee on the units is not as good as other brands. laars.com
LADOGAZ--------<1*--------NA--------NA
These boilers are made in Russia and also sold in Kazakhstan and Kyrgyzstan. They are basic units with copper heat exchangers for durability but the warranty is not very good. ladogaz.ru
LAMBORGHINI--<1*-------<1*-------<1*
These units are available in Europe. The manufacturer's website is not much help and does not have a stated warranty policy. lamborghinicalor.it
LOCHINVAR------<1*--------NA--------NA
The Cadet boiler is a compact unit with built-in outdoor reset control. The warranty on the brand is not very good when compared to other options. lochinvar.com
MAIN-------------<1*--------NA--------NA
The ECO ELITE boilers are made and sold in the U.K. They are available in two sizes but the guarantee on the units is not very good when compared to other brands. They are from BAXI which is a part of BDR THERMEA. mainheating.co.uk
MAKTEK----------<1*--------NA--------NA
This brand is made in Turkey. The EPSILON LCD models have modulating controls and all of the standard features. The SMART LCD model has a wireless room thermostat to control the central heating. The guarantee on the boilers is not as good as other brands. maktek.com.tr
NAVIEN-------------1*--------NA--------NA
This brand features a condensing unit with an efficiency rating of up to 92%. The units use stainless steel heat exchangers for durability and PVC venting for lower installation costs. The unit has auto sensing and adaptive control to maximize efficiency. It includes a LCD remote control and has 24 hour scheduling but the warranty on the unit is not as good as many brands. wholehousecombi.com
NTI---------------<1*--------NA--------NA
The units are made in Canada by NY THERMAL INC and are sold throughout North America. The TRINITY Ti units offer a direct combi-boiler with all of the standard features and a durable stainless steel heat exchanger but the warranty is not very good. nythermal.com
OMEGA-----------<1*--------NA--------NA
This brand is available in two sizes and features a stainless steel burner and copper heat exchanger for durability. The unit uses electronic two stage control which is not as good as true modulating and has an operating efficiency of 89% but it has a lifetime warranty on the heat exchanger. You can purchase the unit online directly from the manufacturer. omega2000group.com
OROFLAM--------<1*--------NA--------NA
This brand offers basic direct combi boilers but their website is not much help. oroflam.it
PEERLESS--------<1*--------NA--------NA
These boilers are made by PB HEAT LLC. The COMBI 160 is a modulating and condensing boiler for ultimate efficiency of up to 93% AFUE. The units feature stainless steel heat exchangers for durability but the warranty on most of the parts is not as good as some other brands and it is only available in one size (160,000 btu/hr). peerlessboilers.com
POTTERTON------<1*--------NA-------<1*
This brand is a part of the BAXI GROUP and is available in the U.K. The GOLD COMBI HE A units are direct combi units that are available in three sizes (24,28,33kw). They are backed by a very good guarantee. The PROMAX SYSTEM HE PLUS A system boilers are available in five sizes but their guarantee is not as good. potterton.co.uk
PROTHERM-------<1*--------NA--------2*
This brand is a part of the VAILLANT GROUP and is available in Europe, Asia, and Africa. The PANTHER range of boilers is available in either system or direct combi models. They have a two speed pump and an optional wireless thermostat with outdoor temperature sensors available. protherm.cz
RADIANT--------<1*-------<1*-------<1*
This brand is manufactured and sold in Italy. The R2K boilers are direct combi and are available in three sizes. The RKA/8 is a storage combi with an 8 liter storage tank while the R1K/B models are system boilers. Their website is not much help and does not have a stated warranty policy. radiant.it
RAVENHEAT------<1*-------<1*--------2*
These units are available throughout Europe. The WHITE HEAT range offers units with all of the standard features but the guarantee is not as good as other brands. ravenheat.co.uk
RAYPAK------------NA--------NA-------<1*
This brand is a part of RHEEM MANUFACTURING. The XPAK is a wall hung modulating high efficiency unit. The unit is only available in two sizes (85000 & 120000 btu/hr). The unit also has a three speed circulator pump that is thermostatically controlled for maximum efficiency. The warranty on the unit is not as good as many brands. raypak.com
REMEHA------------5*--------NA--------2*
This brand is part of the DE DIETRICH GROUP and is available in Europe. The eVITA is a micro-chp unit as well as a direct combi. The AVANTA range is available in either instantaneous dhw or system boiler models. They have a two speed pump, an ECO MODE for energy savings, and a COMFORT MODE (keep hot facility). remeha.nl
RINNAI-----------<1*--------4*-------<1*
The E series units are direct units for homes with smaller domestic hot water requirements. Their warranty is not as good as many other brands. The Q series units offer an indirect tank and a modulating pump for efficiency and to produce larger quantities of domestic hot water. They have a better warranty compared to the other brands. All of the models feature stainless steel heat exchangers for durability. rinnai.us
ROC---------------<1*--------NA-------NA
These boilers are made in China. They have electronic controls but their website is not much help and does not have a stated guarantee for their products. rocgas.com
ROTEX-----------<1*--------NA--------NA
This brand is a part of the DAIKIN GROUP. The GW condensing boiler has advanced digital controls. Their website is not much help and does not have a stated guarantee for the products. rotex-heating.com
SAUNIER-DUVAL--<1*-------NA--------1*
This brand is a part of the VAILLANT GROUP and is available in Europe. The THEMA CONDENS range is available in instantaneous dhw models as well as system boilers. They use mostly standard technology and the guarantee is not as good as some of the other options. saunierduval.com
SILE--------------<1*--------NA-------<1*
These units are made and are available in Italy. The CONDENSA range is available in either instantaneous dhw or system boiler models. They feature durable stainless steel heat exchangers but their website does not have a stated warranty policy. sile.it
SIME---------------<1*--------1*--------3*
This brand is from FONDERIE SIME S.p.a. which is a part of the SIME GROUP. The MURELLE HE range is available in ten models and five sizes. The storage combi model has a five liter storage tank. They have a built-in circulator, expansion tank and air eliminator for easier installation. The units have built-in weather compensation controls for energy savings. sime.it
SLANT/FIN---------1*--------NA--------3*
These units are made in the U.S.A. and are also available in Canada. The VSL boilers are available in a direct combi model and feature electronic control with outdoor reset for added energy savings. The units have durable stainless steel heat exchangers but their guarantee on the other parts is not as good as some of the other brands. slantfin.com
SPACEPAK-------<1*--------NA--------NA
A part of MESTEK, this brand is one of the major brands of high velocity duct systems. The ThermaPak is a gas fired combi boiler that will work with their duct systems. It has all of the standard features but the warranty is not very good. spacepak.com
SQUIRREL-------<1*-------<1*--------NA
These boilers are made in China by DEVOTION DOMESTIC BOILERS and are sold throughout Europe. The units have programmable electronic controls but their website is not much help and does not have a stated guarantee for their products. squirrelboilers.com
STEP------------<1*-------<1*--------NA
The AETERNA FC is a direct combi while the AETERNAfast B FCX has a 60 liter storage tank. Their website is not much help and does not have a stated warranty policy. stepclima.it
STREBEL---------NA--------<1*-------<1*
This brand is a part of the STREBELWERK GROUP. It is made in Austria and available throughout Europe. The VICTRIX range is available in storage or system models. strebel.at
SUPER HOT------<1*--------NA-------<1*
This brand is made in Canada by Allied Engineering Co. The HSE model has outdoor reset temperature control and a three speed pump for added efficiency. The guarantee on the boilers is not as good as other brands. alliedboilers.com
TERMET-----------<1*--------NA--------NA
The ECOCONDENS units are made in Poland and are sold in Europe. They feature a modulating pump and fan as well as the gas control. Their website is not much help and does not have a stated warranty policy. termet.com.pl
TERMODINAMIK-<1*--------NA--------NA
These units are made in Turkey. The HIGHTECH COMBI units are available in two sizes and feature hydroblock construction, a built in programmer, and auto air purging system. They offer room thermostat options as well as an outdoor air sensor for weather compensation control. The manufacturers' website is not much help and does not have a stated warranty policy. termodinamik.com.tr
THERMONA------<1*-------<1*-------<1*
This brand is available in Europe, Asia, and South America. They offer a variety of basic units but the guarantee on them is not very good when compared to other brands. thermona.eu
TRIANGLE TUBE-<1*--------NA-------<1*
This brand is a part of the ACV GROUP and is available in the U.S. and Canada. The PRESTIGE series are system boilers that are available in five different sizes. The CHALLENGER combi features stainless steel burners and outdoor rest control. The warranty on the units is not as good as many other brands. triangletube.com
UNICAL----------<1*-------<1*-------<1*
These boilers are made in Italy. The KON range offers units with electronic controls. Their website is not much help and does not have a stated guarantee for their products. unicalboiler.com
VAILLANT---------<1*--------NA--------2*
This brand is made in Germany and is available worldwide. The ecoTEC range is available in system or direct combi models. They have a modulating pump as well as the standard modulating gas valve. vaillant.com
VANWARD-------<1*-------<1*--------NA
These boilers are made in China. They are basic units with electronic controls but their warranty is not very good when compared to other brands. chinavanward.com
VERGNE---------<1*--------<1*--------NA
These boilers are made in France. The MC2 range offers units with a multi-speed pump and electronic controls. Their website is not much help and does not have a stated warranty policy. vergne-innovation.eu
VIADRUS----------NA--------NA-------<1*
This brand is a part of the ZDB GROUP and is a leading Czech producer. The K4 boilers are basic wall-mounted units. Their website is not much help and does not have a stated guarantee for their products. viadrus.cz
VIESSMANN-------5*---------NA--------2*
The VITODENS 100-W range of units is available in three sizes available and are a good option for your system boiler needs. They offer optional weather compensation controls. The VITOTWIN 300-W is one of the most innovative direct combi boilers on the market as it is a micro-chp unit. viessmann.com
VOKERA----------<1*--------NA-------<1*
This brand is a part of the RIELLO GROUP. The UNICA i range is available in direct combi models. They have optional controls such as a wireless programmable thermostat and a weather compensation control. The duration of the guarantee is not very good. vokera.co.uk
WESTCAST-------<1*--------NA--------NA
The GC160 are condensing, modulating wall-hung boilers. They include an expansion tank and air eliminator but the warranty on the units is not very good when compared to other brands. The brand is a part of MESTEK. westcastboilers.com
WESTEN----------<1*-------<1*-------<1*
This brand is a part of BDR THERMEA. The STAR CONDENS range features durable stainless steel DHW heat exchangers and optional outdoor reset controls. The BOYLER CONDENS units are storage combis with digital controls and a 45 liter tank. Their website is not much help and does not have a stated guarantee for their products. westen.eu
WESTINGHOUSE--<1*-------NA--------NA
These boilers are made by HTP and are available in wall mount or floor standing units. They feature durable stainless steel construction but the warranty on the units is not very good when compared to other brands. westinghousewaterheating.com
WOLF-------------NA-------<1*-------<1*
These units are made in Germany. The COMFORTLINE range offers basic units with electro-mechanical controls. wolf-heiztechnik.de
WORCESTER-----<1*--------NA-------<1*
This brand is a part of BOSCH THERMOTECHNOLOGY and is available in the U.K. and Ireland. The GREENSTAR range is available in either direct combi or system boiler models. They have a variable speed pump and many control options available. The standard warranty is not very good. worcester-bosch.co.uk
ZANTIA-----------<1*-------<1*-------<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. zantia.com