Watts 0120008 3/4 IN Lead Free Tankless Water Heater Valve Set with VersaFit Technology, Female NPT Connections, Hot and Cold Valve Set, 150 psi Relief Valve

Everything on the LFTWHG2 set is 3/4 inch NPT thread. The cold inlet is a female threaded 3/4 inch NPT, and the cold outlet is a 3/4 inch NPT union female thread. On the hot side, the inlet is a 3/4 inch NPT union joint and the outlet is a 3/4 inch NPT union female thread. The unions on the heater side let you break the connection to pull the unit without cutting pipe. Threaded on all four ports, so if you are running copper you will need 3/4 inch male adapters soldered on ahead of the valves.

The relief valve is part of the kit. The 0120008 set ships with a pressure relief valve rated 150 psi, so you are not sourcing that separately to satisfy the heater's relief port. It also includes purge and drain valves on both the hot and cold sides, which is what you use to run a descaling pump through the heat exchanger. One kit covers both the hot and the cold service valve, since it is sold as a hot and cold water set.

Yes. The set carries purge and drain valves on the hot and cold legs, which is the whole point of a tankless service valve kit: you close the isolation valves, hook your descaling pump to the cold purge port and your return hose to the hot one, and circulate cleaner through the exchanger without dropping pressure on the house. No separate tees or boiler drains needed.

The body is a lead free copper silicon alloy, and the kit is sold as a lead free tankless water heater valve set. That is the material spec buyers ask for on potable domestic hot water work. For a facility submittal, cite the Watts 0120008 by model and the lead free copper silicon alloy body.

Two numbers matter and they are not the same thing. The valve bodies carry a 600 WOG rating, which is the working pressure for water, oil and gas service. The relief valve in the kit opens at 150 psi, so that is the ceiling the system sees on the heater side. Domestic water systems normally run 40 to 80 psi, so a 600 WOG body is well inside its range, and the 150 psi relief is what protects the heater if a thermal expansion event spikes the line.

No. There is no check valve in the LFTWHG2 set. It gives you isolation, purge and drain, and a 150 psi relief valve. If the job calls for a check or a backflow device, whether for a recirculation loop or a local code requirement, that is a separate part to order alongside this kit.

Plain ball valves isolate the heater but give you no way to circulate descaler through it, so you end up cutting in tees and boiler drains later. A kit like the Watts LFTWHG2 combines the isolation, the purge and drain ports, and the 150 psi relief valve in one set, with union connections on the heater side so the unit can come off without cutting pipe. On hard water, where annual descaling is the difference between a heat exchanger lasting and failing, the purge ports are the reason to go this route.

Order Watts model 120008, in the LFTWHG2 series, commonly written 0120008. That is the 3/4 inch lead free hot and cold tankless water heater valve set with VersaFit technology and a 150 psi relief valve, on female NPT connections. One model number covers the full hot and cold set, so you are ordering one kit per heater, not a pair.

For a portfolio of 3/4 inch tankless units it works as a single spec line: one model, 120008, covers the hot and the cold valve, all four ports 3/4 inch NPT female, lead free copper silicon alloy body, 600 WOG, with a 150 psi relief and purge and drain ports for the annual descale. Standardizing on it means one part number in the stockroom and the same flush procedure for every unit. Note there is no check valve in the kit, so if some buildings have recirculation loops that require one, that stays a separate line item.