- Outdoor installation with freeze protection
- 83%+ thermal efficiency
- 199,000 BTU maximum input
- 9.4 gallons per minute capacity at 35F degree rise
- Minimum activation flow rate of 0.5 gallons per minute
- Electronic ignition and patented burner design
- Exclusive safety and precision controls
- Can be used in solar thermal, recirculation, radiant floor and space heating applications
- Built for durability and serviceability with 15-year warranty and 20+ year life expectancy
- Available in NG and LP models
- Optional recess box and wireless remote control available
The new 940 ESO is equipped with everything the plumbing contractor needs for outdoor installation including a digital control panel cover. An optional recess box is available which allows the entire unit to be recessed flush with your home’s exterior. The rugged steel recess box accommodates a lock and can be painted for a customized appearance.
Frequently Asked Questions 
Warranty Info
15 year limited warranty on heat exchanger; 3 year warranty if used in direct recirculating applications
15 year warranty on heat exchanger if used if recirculated through a storage tank such as the Ariston mini-tank
5 year warranty on all other parts
Installation Manual