Bosch Therm 940 ESO Tankless Water Heater

The Bosch Therm 940 ESO water heater offers outdoor installation and 6.0-9.4 GPM continuous hot water. Designed for whole house use or light commercial application, it’s a power water heater with 199,000 BTU capacity and a very respectable 83% thermal efficiency. You’ll reduce energy use by up to 35% when replacing an older storage water heater with the Bosch Therm 940 ESO. This Bosch water heater is Energy Star rated and may be eligible for energy credits from your local utility provider.
The non-freeze technology allows you to install this unit outdoors in all climates. For a more finished look, Bosch offers a recessed installation box with a cover that can be painted to blend with your home’s exterior. Outside installation is beneficial in that it lowers installation costs because the venting is much simpler. If you’re looking for similar models to compare, the Rheem RTG95 tankless water heater offers similar capacity and features.

The Bosch Therm 940 ESO tankless heater can handle 2-3 points of application at once. That’s enough for a 3 bedroom home where peak hot water usage can be quite high, or for light commercial applications. The warmer your climate is, the higher the capacity will be, since incoming water will be warmer to start with.

Other specifications you might want to know about include the .5 GPM minimum flow rate that is ideal for low-flow fixtures and the temperature setting of 100-140 degrees F. The higher temperature setting is sufficient for some commercial uses where sanitization is necessary. The unit comes set at 120-degrees but is easily adjusted to meet your specific water temperature requirements. The water heater is fired with an electronic ignition which is durable and dependable. There is no standing pilot light consuming energy even when hot water is not demanded.

You’ve got options with the Bosch Therm 940 ESO tankless heater. It can be used for standard hot water production but is also designed for inclusion in a solar energy system or for use in radiant heat floor systems or space heating systems. A recirculating storage tank like the Ariston mini-tank will reduce energy use as well as extend the warranty. The standard warranty for direct recirculating is 3 years. With a storage tank, it is 15 years. The heat exchanger is warrantied for 15 years. All other parts are backed by Bosch with a 5-year warranty.

Bosch makes some of the highest-rated gas water heaters in the market, and this is one of them. See our long list of tankless water heater reviews from other top brands like Rinnai, Rheem, Noritz and Navien for other models you might want to consider alongside the Bosch Therm 940 ESO water heater.

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