U.S. Boiler Co.’s Alta line of condensing boilers and combi-boilers features next-generation gas-adaptive technology that provides the shortest installation time and lowest operating costs.

The Rinnai I-Series boilers offer both heat-only and combination models with simultaneous delivery of heat and hot water in one unit.

The Rheem Combination Boiler offers efficient heating combined with continuous hot water from one unit, the company notes.

With the Bosch Singular combi-boiler, one system satisfies two household needs: heating and hot water. Featuring 95% AFUE efficiency, the Singular provides efficient, dependable home heating and up to 7.7 gpm of domestic hot water production.

The Brute FT’s advanced technology delivers quick response, exceptional efficiency and years of reliable service, Bradford White notes.

The Noritz Residential Combination Boiler allows for simultaneous residential domestic water and space heating.