Mixing valve

Robert O'Connor_12

I need advice on domestic mixing valve options. The water heater is only a 53 gallon indirect (1&1/2 years young) but the house recently has increased hot water demand (intermittent due to house guests and visitors). I'd like to turn up the indirect temp to 140* (or slightly above) to give them a bit of reserve and kill off any funky germs that could possibly grow in there, then mix down the domestic (hence the need for the MV). A local supplier said they had a Honeywell MV for about 100 bucks (no part or model number given) or option 2 was from the heating supply our company buys from which was a Watts N-170-US @1". The heating supplier quoted $459, thats a BIG $$ difference. Now from reading this board it is apparent that pricing isn't really discussed but does that also mean material as well. I'm just interested in a 1" sweat MV that has a range from say 90* to 130* and it must be reliable unlike many we see on tank-less heaters that go bad every three years or less. Thanks!

You guys rock! I'm so glad I found this site..

G

ALH_4

Valves

The Cv rating of the valve is more important than the connection size. Double check that the cheaper valve will handle the flow rate you require. There may also be other features like check valves included with the more expensive valve.

Lyle C

Mixing Valve

More knowageable Folks on this site could quote the standard . But, as far as I know the N-170 is no longer allowed for this purpose as it will not shut off the hot water in the event of the loss of cold water, resulting in a nasty burn. I do belive the Honeywell is approved . But, as Andrew stated all must be sized properly. Remember a mixing valve is a control that must be maintained .