Top Basic Unit:

Our top pick in the basic category is the OME 514-PV-ZP from Omega 2000 Corp. The units have a power vent for flexible installation and feature two stage electronic controls for added fuel savings. They are also backed by a very good warranty.

World's best gas tankless water heater:

The best high efficiency gas tankless water heater is from INTELLIHOT. These water heaters feature a smart control that learns the hot water use of the home and programs itself for energy savings. They feature a stainless steel heat exchanger for durability and are available in two sizes. They have built-in recirculation for water savings and are backed by a very good guarantee.

Other Gas Tankless Water Heater Ratings

We continue our gas tankless water heater ratings with an alphabetical list of manufacturers and reviews of their products.

BRAND----------BASIC--HIGH EFFICIENCY

ALMONARD--------<1*------------------NA

These water heaters are made in India and are available in three sizes. They are only for LPG and have mechanical controls with 1.5V batteries for ignition. Their website is not much help and does not have a stated warranty policy. almonard.co.in

AMERICAN-----------4*------------------5* 

This brand is a part of A. O. Smith and offers a wide selection of units in both indoor and outdoor mounted units. Their unique air-fuel ratio sensor monitors and optimizes combustion efficiency and the units are backed by a good guarantee. americanwaterheater.com

ANDREWS-----------NA------------------1*

The FASTFLO water heaters are available in both indoor and outdoor models. They feature capacity modulation and a flowrate of up to 15 liters/minute. The brand is a part of BAXI commercial and the units have a durable copper heat exchanger but the warranty is not very good when compared to other brands.  andrewswaterheaters.co.uk

AO SMITH-----------4*------------------5*

This brand offers a wide selection of units for both indoor and outdoor installation. The high efficiency models use durable copper and stainless steel heat exchangers. All of their units are backed by a very good warranty but they must be installed by a professional. hotwater.com

AQUAMAX---------<1*------------------NA 

This brand is a part of RHEEM AUSTRALIA PTY and is made and sold in Australia. They offer two sizes of basic units and an optional remote temperature controller. The warranty on parts other than the heat exchanger is not very good when compared to other brands. aquamax.com.au

ARION-------------<1*------------------NA 

These water heaters are made and sold in Egypt by ABOU SEIF. They offer two sizes of units but use basic mechanical controls. Their website is not much help and does not have a stated guarantee for the products. abouseifgroup.com

ARISE-------------<1*------------------NA 

These water heaters are made and sold in India. The FUMO models have electromechanical controls and battery powered ignition. They have a built-in twenty minute timer and a winter/summer selector with different preset temperatures for energy savings. They are available in two sizes but the warranty on the units is not very good when compared to other brands. ariseindialtd.com

ARISTON-----------<1*------------------NA 

The FAST units have basic controls and piezo ignition while the FAST PREMIUM have automatic ignition. The NEXT models have electronic controls and are available in both internal and external mounted units. Their website is not much help and does not have a stated warranty policy. ariston.com

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

This brand is a part of BDR THERMEA and is made and sold in Turkey. The BH13 is a basic tankless water heater with electromechanical controls. The guarantee on the units is not very good when compared to other brands. baymak.com.tr

BENCHMARK-------<1*-----------------NA  

These water heaters are made in India. They offer a variety of models and sizes most of which have basic electromechanical controls. Their website is not much help and does not have a stated warranty policy. benchmarkagencies.com

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

The IDRABAGNO ESI water heaters feature sealed combustion and electronic controls. The IdraBALCONY units are for external installation and the brand is available in Europe, China, & South America. Their website is not much help and does not have a stated guarantee for their products. berettaboilers.com

BOSCH--------------4*------------------5*  

This brand offers a wide selection of models for both indoor or outdoor installation and in a variety of sizes to match the needs of the home. The GREENTHERM units are high efficiency models that are backed by a very good warranty but must be installed by a professional. bosch-climate.us

BRADFORD WHITE-----3*--------------4*  

The INFINITI water heaters are available in high and medium efficiency models. They have digital controls with built-in freeze protection and can be mounted indoors or outdoors. They have scale reduction technology and are backed by a very good guarantee. bradfordwhite.com

BRASEC-----------<1*------------------NA 

This brand is made and sold in Peru by MACADI INTERNATIONAL. They offer basic units with mechanical controls and are available in five sizes. Their website is not much help and does not have a stated guarantee for their products. macadinternational.com

CAL O REX--------<1*------------------NA  

This brand is made and sold in Mexico. They offer only basic models with a warranty that is not very good. calorex.com.mx

CHOFU--------------2*------------------NA  

These units are made in Japan and are available for either indoor or outdoor installation. They have built-in scale detection and offer an optional remote control. They have a decent warranty. chofu.co.jp

CLASIC------------<1*------------------NA 

This brand offers a variety of models with mechanical controls. Their website is not much help and does not have a stated guarantee for their products. clasic.com.pe

COSMOGAS--------NA------------------2*

These water heaters are made in Italy. The AQUAdens 220M feature modulating controls as well as an outdoor reset for added energy savings. They have a unique variable radial circulation heat exchanger that is efficient and is made of stainless steel for durability. cosmogas.com

DECO--------------<1*------------------NA 

These units are made and sold in India and have durable stainless steel burners. They are basic water heaters with mechanical controls and the warranty on the units is not very good. decoindia.in

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

This brand is made in Turkey and is a part of the VAILLANT GROUP. They offer basic battery operated or fully automatic water heaters but their website is not much help and does not have a stated guarantee for their products. demirdokum.com.tr

DEWHOT----------<1*------------------NA  

This brand is made and sold in South Africa. They feature stainless steel units that are mounted outdoors and use battery ignition. They are available in six sizes to match the water needs of the home but use basic mechanical controls and are for LPG gas only. They can be purchased directly from the manufacturer but the warranty on the units is not very good. dewhot.co.za

DUX-----------------1*------------------NA 

This brand is a part of GWA INTERNATIONAL LTD and is made in Australia. The ENDURANCE range offers four sizes of basic units that have a pretty good warranty. dux.com.au

ECCOTEMP---------2*------------------NA  

This brand offers both interior and exterior mounted water heaters that can be purchased from them online. They have a digital remote control and a good warranty. eccotemp.com

ELECTROLUX-------NA------------------4*  

This brand features water heaters that are made of stainless steel for durability and style. They have LED digital displays and hardwired remote controls as well as being backed by a very good guarantee. electroluxappliances.com

ETERNAL------------NA------------------5* 

These units are made in Taiwan by GRAND HALL and sold worldwide. The GU120 is available in either wall mount or floor standing models and are a kind of hybrid tankless/tank unit. They have a built-in two gallon reserve tank and are self-cleaning. They feature a durable stainless steel heat exchanger and are backed by a very good warranty. eternalwaterheater.ca

FERROLI-----------<1*-----------------NA  

The SKY RANGE features three sizes of basic units that have modulating controls and a durable copper heat exchanger. The ZEFIRO models use electromechanical controls and have battery powered ignition. ferroli.it

FRESH------------<1*------------------NA 

These units are made in Georgia and use basic mechanical controls. They are available in two sizes but their website is not much help and does not have a stated warranty policy. fresh.com.eg

GERMAN POOL---<1*------------------NA  

This brand offers three models with electronic controls but the warranty is not as good as many brands. germanpool.com

GSW-----------------NA------------------5* 

This brand is a part of A.O. SMITH and is made and sold in Canada. They offer a variety of models with a very good guarantee. gsw-wh.com

HACEB-------------<1*------------------NA 

These water heaters are made in China and are sold in Colombia. They are available in three sizes and have a durable copper heat exchanger. They offer both electromechanical and electronic controls but the warranty is not very good when compared to other brands. haceb.com

HEAT WAVE--------<1*------------------NA

This brand is made and sold in Mexico by MACON INDUSTRIES. They only offer one size of unit and it uses basic electromechanical controls. The guarantee on the unit is not very good when compared to other brands. heatwave.com.mx

HTP------------------NA------------------4* 

The HYDRA SMART water heaters are high efficiency modulating units that are backed by a good guarantee. They have durable stainless steel heat exchangers and a gas leak detector for added safety. htproducts.com

HYLEX-------------<1*------------------NA  

These water heaters are made in India and sold throughout Asia. They offer a basic unit that burns LPG gas and has a capacity of 6.5 liters/minute. Their website is not much help and does not have a stated guarantee for their products. hylexappliances.net

IMMERGAS-------<1*------------------NA  

The CAESAR STAR units are basic fan-assisted sealed combustion tankless water heaters with durable copper heat exchangers. They can be installed either indoors or outdoors. The units are available in Europe but their website is not much help and does not have a stated warranty policy. immergas.com

INDO---------------<1*------------------NA

This brand is made and sold in India. They only offer one size of unit and it has basic mechanical controls. Their website is not much help and does not have a stated warranty policy. indoappliances.com

INTELLIHOT---------NA------------------5* 

These water heaters feature a smart control that learns the hot water use of the home and programs itself for energy savings. They feature a stainless steel heat exchanger for durability and are available in two sizes. They have built-in recirculation for water savings and are backed by a very good guarantee. intellihot.com

ITALTHERM--------<1*------------------NA 

The DYNO F features automatic ignition and electronic modulation of the output. The brand is made and sold in Italy but their website does not have a stated warranty policy. italtherm.it

JACUZZI------------3*------------------NA 

This brand is sold and installed through LOWES HOME IMPROVEMENT stores in the USA. They offer both internal and external mounted units in two sizes. They feature digital controls and are backed by a good warranty. jacuzzihotwater.com

JOANNES----------<1*------------------NA 

This brand is a part of FINTERM and is sold in Italy. The YES 14 SJ models have electronic modulating controls and a durable copper heat exchanger. They use sealed combustion for added energy savings but their website does not have a stated guarantee for the units. joannes.it

JOHN WOOD---------4*------------------5*

These water heaters are made in Canada by GSW which is owned by A.O. SMITH. The units feature durable heat exchangers and modulating controls. They are backed by a good warranty. johnwoodwaterheaters.com

KELVINATOR--------1*------------------NA 

The INSTAKNIGHT water heaters are available in a variety of sizes and are fro LPG gas. They are made by Electrolux and sold in Australia but their website is not much help. kelvinator.com.au

KIRIAZI------------<1*------------------NA 

This brand is made in Egypt and offers basic units with mechanical controls. They have durable copper heat exchangers but their warranty is not very good when compared to other brands. kiriazi.com

KRUGER-----------<1*------------------NA 

These water heaters are made and sold in Mexico. They have electronic controls but their website is not much help and the guarantee on the units is not very good. kruger.com.mx

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

These units are made in Russia and also sold in Kazakhstan and Kyrgyzstan. They are basic units with a durable copper heat exchanger but the guarantee on the parts other than the heat exchanger is not very good. ladogaz.ru

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

The ONE water heaters have battery powered ignition and a durable copper heat exchanger. Their website is not much help and does not have a stated warranty policy. lamborghinicalor.it

LONGVIE----------<1*------------------NA 

This brand offers basic water heaters with mechanical controls. Their website is not much help and does not have a stated guarantee for their products. longvie.com

MACRO------------<1*-----------------<1* 

This brand is made in China and offers a variety of models. They use durable copper heat exchangers but their website does not have a stated guarantee for their products. en.chinamacro.com

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

These water heaters are sold in the U.K. and the brand is a part of BDR THERMEA. They offer basic fan flue or balanced flue units but the warranty is not very good when compared to other brands. mainheating.co.uk

MARC-------------<1*------------------NA  

This brand is a subsidiary of MAHAVIRA GROUP and is made in India. They INSTA HOT range offers very basic water heaters with mechanical controls. Their website is not much help and does not have a stated warranty policy. marcindia.biz

MAREY------------<1*------------------NA  

These water heaters are made in China and are sold throughout North America. They offer a wide selection of units that use battery power for ignition. The warranty is not very good when compared to other brands. marey.com

MIDEA-------------<1*------------------NA 

The JSG 32-16VH water heaters have electronic controls and a durable copper heat exchanger. Their website is not much help and does not have a stated guarantee policy. midea.com

NAVIEN--------------NA------------------5* 

This brand offers state of the art units that include a built-in buffer tank and recirculation pump. This means that you no longer have to wait for the cold water to get out of the pipes in your house. They feature durable stainless steel heat exchangers and are backed by a very good warranty. navienamerica.com

NIKO---------------<1*------------------NA 

These water heaters are made and sold in Indonesia. They offer only one size of basic units with mechanical controls. Their website is not much help and does not have a warranty policy. nikoelectronic.com

NORITZ---------------3*------------------4*

The ecoTOUGH line offers three sizes of high efficiency units in both indoor and outdoor mounted models. The proTOUGH line offer units with standard efficiencies and the ValueSolutions line features very basic and relatively inexpensive water heaters. The units are backed by a very good warranty. noritz.com

OMEGA---------------5*------------------NA

These basic water heaters with mechanical controls are made in the USA. The units can be purchased directly from them online and are backed by a very good warranty. omega2000group.com

OMEN---------------<1*------------------NA

This brand is made and sold in India. They offer basic units with mechanical controls and burn LPG gas. Their website is not much help and does not have a stated warranty policy. omen-industries.com

PADMINI-----------<1*------------------NA

These water heaters are made and sold in India. The FLORA units are for use with LP gas and feature basic mechanical controls with a battery operated ignition system. Their website is not much help and does not have a stated guarantee for their products. padminiappliances.com

PALOMA-------------3*------------------4* 

This brand offers a wide selection of units including six sizes of basic models to match the needs of any home. The PHH-32 is a high efficiency unit that is available as indoor or outdoor mounted versions and are backed by a very good warranty. palomatankless.com

RACOLD-----------<1*------------------NA 

The NATURAL FLUE models are basic water heaters with mechanical controls. The brand is a part of MTS GROUP and is made in India but the guarantee on the units is not very good. racold.com

RELIANCE-----------3*------------------4* 

This brand offers both indoor and outdoor mounted units and they are backed by good guarantees. They feature durable copper heat exchangers and stainless steel secondary heat exchangers on condensing models. The units can be purchased at many hardware stores in the USA. reliancewaterheaters.com

RHEEM---------------3*------------------4*

This brand offers three sizes of basic units in either indoor or outdoor versions. The PRESTIGE units are high efficiency models with durable stainless steel heat exchangers and electronic controls. rheem.com

RICHMOND-----------3*------------------4*

These water heaters are made by RHEEM MANUFACTURING. The RMTG models are basic units that are available in three sizes. The ENCORE RMTGH models are high efficiency units and they are backed by a very good warranty. The brand offers both indoor & outdoor mounted units. richmondwaterheaters.com

RINNAI---------------2*------------------4*

The VALUE SERIES units are basic tankless units that are for small to medium sized homes and are available for either indoor or outdoor installation. The LUXURY SERIES offers high output versions suitable for large homes. The ULTRA SERIES features high efficiency units with enhanced scale detection capability and a very good warranty. rinnai.us

RUUD-----------------NA------------------4*

This is another brand that is made by RHEEM MANUFACTURING. The PROFESSIONAL PRESTIGE SERIES offers two sizes of high efficiency units and they are available for indoor or outdoor mounting. ruud.com

SOLE---------------<1*------------------NA 

These water heaters are made and sold in Peru by MT INDUSTRIAL. They offer five sizes of units in both unvented and vented styles. The units can be purchased directly through their website but the guarantee is not very good when compared to other brands. sole.com.pe

SPHEREHOT-------<1*------------------NA 

This brand is made in India. The REVERE are basic units with durable copper heat exchangers but their guarantee is not very good when compared to other brands. spherehot.com

STATE----------------3*------------------4* 

This brand is a part of AO SMITH. They offer a wide selection of units including both indoor and outdoor models that are backed by a good guarantee. statewaterheaters.com

SUMMERCOOL-----<1*------------------NA 

These water heaters are made and sold in India. They are basic units with mechanical controls. Their website is not much help and does not have a stated warranty policy. summercoolindia.com

TAKAGI---------------4*------------------5*

These units are available in a wide selection of models. They use copper for primary heat exchangers and stainless steel for durability on the the secondary heat exchangers and are backed by a good warranty. takagi.com

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

The TERMAQ models are made in Poland and are sold in Europe. They offer both piezo and electronic ignition models and feature durable copper heat exchangers. The AQUA COMFORT TURBO water heaters are high efficiency units with a durable copper heat exchanger. Their website does not have a stated warranty policy. termet.com.pl

TERMODINAMIK---<1*------------------NA

This brand is made in turkey and features units with electronic modulating controls. Their website is not much help and does not have a stated warranty policy. termodinamik.com.tr

THERMO SOLUTIONS--NA--------------<1*

This brand is made and sold in Costa Rica. They are basic water heaters with electromechanical controls. Their website does not have a stated guarantee for the units. thermosolutionsgroup.com

TRUEPOWER-------<1*------------------NA

This brand is made and sold in India. They are available in four sizes but feature basic mechanical controls and battery powered ignition. Their website does not have a stated guarantee for their products. truepower.in

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

These water heaters are made in Italy. The IDRONIK TN is a basic model that uses battery power for ignition. The IDRONIK TS is a sealed combustion model that has modulating capability. Their website is not much help and does not have a stated warranty policy. unicalboiler.com

UNIVERSAL--------<1*------------------NA

This brand is made in Egypt and offers two sizes of units. They have mechanical controls and the guarantee on the units is not very good when compared to other brands. universalgroup.org

US CRAFTMASTER---3*------------------4*

The GTU series water heaters offer both basic and high efficiency units. They are available for mounting either inside or outside and offer an optional remote temperature controller. The brand is made by AMERICAN WATER HEATER which is a part of A.O. SMITH and they are backed by a good warranty. uscraftmaster.com

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

The turboMAG water heaters have sealed combustion and modulating capacity for added efficiency. Their website is not much help and does not have a stated warranty policy. vaillant-export.com

VANWARD---------<1*------------------NA 

These water heaters are made in China. They offer standard as well as sealed combustion models but their guarantee is not very good when compared to other brands. chinavanward.com

VOKERA-----------<1*------------------NA 

The AquaNova line offers basic tankless water heaters with modulating ability. They are available in Europe but the warranty is not very good. vokera.co.uk

WAIWELA------------3*------------------4*

This brand is made by PALOMA. They offer both indoor and outdoor units and they are backed by a good guarantee. waiwela.com

WARMEX-----------<1*------------------NA 

These water heaters are made and sold in India by STAR ELECTRICALS. They offer a basic unit with electromechanical controls and an output of 6.5 liters per minute. The warranty on the unit is not very good. warmex4u.com

WESTINGHOUSE----NA------------------4*

This brand is made by HTP and offers both natural gas and LPG units. They are high efficiency and feature durable stainless steel construction and modulating technology. They are backed by a very good guarantee and can be purchased online. westinghousewaterheating.com

WHITE WHALE-----<1*------------------NA

This brand is made and sold in Egypt. They are only available in two sizes and their website is not much help. whitewhale.com.eg

ZERO---------------<1*------------------NA

This brand is made and sold in South Africa. They offer six sizes of units but they have basic mechanical controls and their website is not much help. zeroappliances.co.za

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