Tankless 3 and 4 GPM Water Heaters

These more powerful tankless water heaters are not much more expensive than their smaller cousins, so they might be worth your investment for the added coverage that they can provide.

They are used to provide hot water for everything from RVs to small homes. The best results are reported when not more than one shower and sink are being used at one time. Beyond that, tankless heaters of this size are sorely tested.

Users report that installation for these small heaters is not too difficult and that hot water is delivered in anywhere from 5 to 15 seconds. Among the brands and models in this category are:

The Ecosmart ECO 27 electric model has drawn rave reviews but costs a bit more than other models in this class. It provides 3 GPM of heat.

The Bosch AE125 PowerStar (4 GPM) is another model in this pricier range, but more than a few users have complained about company support when problems arise.

Tankless 3 and 4 GPM Water Heaters – High to low Ratings

Ecosmart ECO 27

Ecosmart ECO 27 27 KW at 240-Volt Electric Tankless Water Heater with Patented Self Modulating Technology

Rating: (4.8 out of 5 stars)
Efficiency and reliability are two things you must consider when purchasing a water heater given all the available options in the market today. And if you live in an area where the temperature of incoming water reaches a low 37oF, then … [ more ]
Price Indication:
$380 – $420

Stiebel Eltron Tempra 20 Plus

Stiebel Eltron Tempra 20 Plus Electric Tankless Whole House Water Heater, 240 V, 19.2 kW

Rating: (4.8 out of 5 stars)
The electric Stiebel Eltron Tempra 20 Plus is the less expensive alternative to gas-powered tankless water heaters, both in terms of unit cost and installation fees. The hot water portion of your electrical bill is reduced by … [ more ]
Price Indication:
$500 – $600

Stiebel Eltron Tempra 24 Plus

Review on Stiebel Eltron Tempra 24 Plus Electric Tankless Water Heater

Rating: (4.6 out of 5 stars)
These days many people live in limited space like apartments or condos. And if you are one of them and in the market for a water heater, do check out the Tempra 24 Plus Electric Tankless Water Heater by Stiebel Eltron. Its compact size will save you … [ more ]
Price Indication:
$650 – $750

Rheem RTE 9

Rheem RTE 9 Electric Tankless Water Heater, 3 GPM

Rating: (4.5 out of 5 stars)
Rheem’s reputation in providing high quality water heaters remains solid with the RTE 9 Electric Tankless Water Heater. This on demand water heater is perfect for applications within the home, apartment, condo, office, hospitals, laboratories and even recreational vehicles (your boat included). For … [ more ]
Brand:Rheem
Size:3 GPM
Price Indication:
$160 – $180

Rheem RTE 13

Rheem RTE 13 Electric Tankless Water Heater, 4 GPM

Rating: (4.4 out of 5 stars)
The Rheem RTE 13 is an electric tankless water heater which is ideal for point-of-use applications. Its compact profile allows installation to be convenient, especially for those living in homes with limited spaces. It is built with a compact and efficient design, … [ more ]
Brand:Rheem
Size:4 GPM
Price Indication:
$200 – $230

Eccotemp FVI-12-LP

Eccotemp FVI-12-LP High Capacity Propane Tankless Water Heater

Rating: (4.0 out of 5 stars)
For those that do not live in all electric houses, there is a cheaper and more eco-friendly choice for you when it comes to water heaters: the propane powered Eccotemp FVI-12 LP High Capacity Tankless Water Heater. This indoor water heater produces … [ more ]
Brand:Eccotemp
Size:3 GPM
Price Indication:
$250 – $280

Eccotemp FVI-12-NG

Eccotemp FVI-12-NG High Capacity Gas Tankless Water Heater

Rating: (3.9 out of 5 stars)
Similar to the Eccotemp FVI-12-LP, the FVI-12 NG is an electric high capacity tankless water heater, but it is fueled by natural gas. Likewise, this indoor unit delivers 3.4 gallons per minute of hot water that is sufficient for light to moderate demands … [ more ]
Brand:Eccotemp
Size:3.4 GPM
Price Indication:
$250 – $280

Bosch AE125 PowerStar

Bosch AE125 PowerStar 4 GPM Indoor Electric Tankless Water Heater, White

Rating: (3.2 out of 5 stars)
The Bosch AE125 Powerstar Electric Tankless Water Heater delivers up to four gallons per minute (4 GPM) and can supply water for two kitchen sinks or for one major appliance at a time. This indoor water heater is suitable for areas with ground water temperature below 60oF … [ more ]
Brand:Bosch
Size:4 GPM
Price Indication:
$650 – $750