ExistingBoiler

Return CirculationPump

HotSupply

1" Central PEX®

HotSupply

OptionalValves

Y-Strainer

Wraparound Pumpruns continuously circulating through the water-to-water heat exchanger maintaining the water temperature in the existing boiler.

This horizontal assemblymust not exceed a heightof 4 inches above topof water heater.

For illustration purposesonly, water heater stylesmay vary.

Water-to-WaterHeat Exchanger

ThermostaticMixing Valve

A pump must be installed in the hot supply line between the outdoor furnace and thermostatic valve.

Hot Supply from Pumpon Outdoor Furnace

Return toOutdoor Furnace

ThermostaticValve (optional)

NOTEOutdoor furnace watertemperature setpoint shouldbe set at 185˚F minimum.

NOTEInstaller must comply with all applicablecodes and regulations.

(with Wraparound Pump)Existing Boiler - Pressurized