A. O. Smith’s line of high-efficiency condensing gas tank water heaters are the high performance answer for your hot water needs. These models are built to save energy with a helical heat exchanger to maximize efficiency and distribute heat more evenly than standard gas water heaters.

ProLine® XE Condensing Tankless Water Heater Family State's Condensing Tankless Gas Water Heaters are available in Residential and Commercial line ranging from 120,000 BTU/h to 199,000 BTU/h with options for natural gas and propane.

The ATO-540H-N tankless water heater uses up to 199,000 BTU/hr of natural gas to deliver an endless supply of hot water for a 3 bath home in northern climates and up to a 4 bath home in southern climates (one shower head per bath). Utilizing condensing technology, this heater is extremely efficient with a Uniform Energy Factor of 0.95.

This is always the hot-selling and most praised natural gas tankless water heater. Because of its condensing design, there are dual venting options you can choose, both with cheap materials, include concentric PVC and twin pipe. We all know that natural gas tankless water heater is normally large power type, of course, this is not an exception.

Larger families — that typically use more hot water — will save even more. Save energy and the environment. You can cut your water heating energy use by 30% with a new ENERGY STAR qualified gas condensing model. By shaving about 75 therms from your natural gas bill every year, you are also reducing your greenhouse gas emissions.

The ATI-310C-N tankless water heater uses up to 190,000 BTUs of Natural Gas or Liquid Propane to deliver a max flow rate of 8.0 GPM. It utilizes condensing technology to achieve a Uniform Energy Factor of 0.82.

7 Rheem RTGH-84XLN Outdoor Natural Gas Condensing Tankless Water Heater. This is another top quality gas water heater that you can get for the house right now. It is made to be impressive in terms of energy efficiency. It comes with an impressive energy factor of 0.82.

Is a condensing gas water heater DIY? If you know how to reconfigure gas pipe, install new venting and add a 110-volt receptacle, you can install this heater. Is a condensing gas water heater for you? If you’re replacing an existing gas water heater and need lots of hot water for long or multiple showers and tub fills, and want a high flow ...