High Efficiency Compact Design Provides Unlimited Heat and/or Hot Water - Micro Boilers provide unlimited space and/or water heating while operating within their designed BTU output and gallons per minute range, providing the perfect source of heat for radiant floor heating systems, in-duct heating coils, baseboard radiators and combination water/space heating systems. Micro-Boilers are the ideal replacement for traditional boilers and tank-type water heaters for applications requiring up to 155 degree F water temperature. When installed as part of a total system energy conservation solution, Micro-Boilers facilitate the use of active renewable energy sources such as solar and geothermal. Micro-Boilers can be used in potable water systems or with glycol-based low pressure/low temperature hydronic heating systems. Micro-Boilers install inside closets, or on almost any wall. Heat is provided only on demand, virtually eliminating standby heat loss, resulting in over 99% efficiency.