Watts 0125110 3/4 In Lead Free Tankless Water, Female Union Tailpiece, Heater Hot And Cold Valve Set No Spring Check, 150 psi Relief Valve

Every port on the Watts LFTWH 0125110 kit is 3/4 inch NPT. The cold side comes in through a 3/4 inch union joint and leaves through a 3/4 inch female threaded port; the hot side takes a 3/4 inch female threaded inlet and leaves through a 3/4 inch union joint. So the unions land on the heater ports and the female threaded ends pick up your system piping, all in 3/4 NPT.

No. The 0125110 is the no spring check version of the LFTWH service valve set. If your installation needs backflow prevention or your heater manufacturer calls for a check on the cold inlet, you'll have to add one separately or specify a version of the kit built with one.

Not for the pressure side. The 0125110 set ships with a pressure relief valve built into the hot side, rated 150 psi. Confirm what your heater manufacturer and local code require for the specific unit, since some tankless units come with their own relief provision.

Flushing is what this set is built for. Both valves carry purge and drain ports, so you isolate the heater, hook a pump hose to the cold service port and a return hose to the hot side, and circulate descaler without breaking any unions. No additional isolation tees are needed.

Yes. The body is a lead free copper silicon alloy and the ball is lead free brass, which is what puts it in the LFTWH lead free line for potable hot and cold service.

The ball valves carry a 600 WOG rating, so they're good for 600 psi on water, oil, or gas service well above any residential or light commercial domestic water pressure. The relief element on the set is set at 150 psi. PTFE seats handle the hot side temperatures of a domestic water heater run.

The union joints sit on the cold inlet and the hot outlet, which is the pair of connections that meet the heater. That lets a tech break the heater loose at two nuts and pull it without cutting pipe or disturbing the threaded connections into the building piping. For a property manager with several units on a flush schedule, that's the difference between a wrench job and a repipe.

Country of origin on the 0125110 valve set is the United States. If your job carries a domestic sourcing requirement, that's the line item your submittal needs.

Order it as Watts 0125110, manufacturer part number 125110, in the LFTWH series. It's a matched hot and cold pair, not a single valve, so one kit covers both sides of the heater.