Water-to-water heat pumps, supplied from geothermal earth loops, represent a growing sector of the hydronic heat source market. Most current-generation models can produce water temperatures up to about 125° F, perhaps a little higher if you’re willing to push the compressor operating envelope.
Most hydronic systems have the boiler running up to 180° F with water returning from the system at 160°. This rarely happens in real life, but it’s the traditional way we do things.
Featuring a 95% AFUE rating, the Weil-McLain ECO Tec meets nearly all residential space and domestic hot water heating needs, including multi-zone and combi-applications.
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.
Instinct floor standing boilers include a Caleffi 548 Series separator, left or right-side boiler/gas connections, Wi-Fi connectivity, CTRLMAX 60-second setup, a stainless-steel fire tube heat exchanger, a piece- of-mind warranty, and Combi-units have incredible 5-plus- gpm DHW output, Caleffi explains. Available in Solo 110, 155, 199 and Combi 155, 199.