an expansion module is necessary to link multiple boards together

a furnace that fails to ignite despite a call for heat

or if the gas flow is restricted

it prevents thermal overload and maintains the integrity of the refrigeration cycle

The internal design eliminates close-fitting sliding parts in the water passages

Grundfos 595916 Pump 321894-706 an expansion module is necessaryThe Grundfos 595916 (Model UP15 10SU7P TLC) is a heavy duty, stainless steel hot water recirculating pump designed specifically for retrofit applications in residential systems lacking a dedicated return line. This 115V single phase circulator utilizes the existing cold water line to loop thermal energy back to the water heater, ensuring instant hot water delivery at the furthest fixture. As a veteran grade recirculation system, it features a 1 25 HP