Specification Grade Heating, Cooling & Ventilation Systems & Products


Commercial Condensing Boilers



H2O Boiler commercial condensing boilers are innovation-award winnig hot water heaters with nominal ratings of 200,000 BTU/hr to 2.500,000 BTU/hr. Our heat exchangers are a state-of-the-art design that provides a unique counter-flow process and allows for the highest thermal efficiencies in the industry. We offer over 5 different models, 

Whatever your needs, our sales and customer service team is ready to help you find the right unit(s) for your next installation. 



Up to 98% thermal efficiency  

Compact design and smaller footprint

316L stainless steel heat exchanger

Thermal shockproof

Category II or IV direct venting

Easy to install and low maintenance

3:1 Turndown ratioBurner options: GMI Mesh (20:1 Turndown ratio), 

Industrial Combustion, Riello, Webster, Powerflame and others

Control options: Siemens LMV37, Honeywell Sola, and Autoflame Mini MK8

Standard uncontrolled NOx; 

Available in low NOx configuration (< 9 ppm)

Also available in stackable configuration


10 year prorated warranty on heat exchanger against corrosion of flue gases.

OEM warranty on all other components.

20 year thermal shock warranty on heat exchanger