Mixing valve just before fixture

ChrisJ

Does anyone make a mixing valve intended to be installed between the stops and a bathroom faucet?
What about faucets with built in mixing valves?

I run our HW near 140F and my wife hates it and I don't want to lower it. The kitchen sink, dishwasher etc like it among other reasons.

While we're talking bathroom faucets, what's a nice flow rate these days? 2.2 seemed to be the old one, but how bad are the 1.2's and 1.5s?

Paul Pollets

A thermostatic mixing valve is installed on the HW Tank on the HW outlet. It mixes the outbound temp to 120 degrees to the fixtures. This is called for in the code. 140 is scalding and can cause serious burns. It's fine to keep the tank at 140...it minimizes legionella bacteria.

ChrisJ

Paul Pollets said:

A thermostatic mixing valve is installed on the HW Tank on the HW outlet. It mixes the outbound temp to 120 degrees to the fixtures. This is called for in the code. 140 is scalding and can cause serious burns. It's fine to keep the tank at 140...it minimizes legionella bacteria.

I have a recirculating loop which I will not be keeping at 120.
So, I need another option.

Paul Pollets

Why does the recirc loop matter? Usually it's the same temp as the outlet of the tank. I presume it's pushing towards the tank and has a check valve on the pump's discharge side?

ChrisJ

Paul Pollets said:

Why does the recirc loop matter? Usually it's the same temp as the outlet of the tank. I presume it's pushing towards the tank and has a check valve on the pump's discharge side?

Because I don't want to risk Legionella in the loop.
I can actually keep the kitchen loop it's own temperature as the bathrooms are isolated from it. So, I could put a mixing valve on just that loop, but Legionella does concern me even if the tank is in theory free of it. Could I be concerned over nothing? Perhaps, I don't know.

ratio

I know I've seen point of user mixing valves. Might be called anti-scald valves.

I'm getting pretty far out of my area, but I think they're required by code, at least in certain circumstances.

ChrisJ

ratio said:

I know I've seen point of user mixing valves. Might be called anti-scald valves.

I'm getting pretty far out of my area, but I think they're required by code, at least in certain circumstances.

Ah ha.
"point of use" is what I needed in my search.

https://www.supplyhouse.com/Zurn-38-ZW3870XLT-4P-3-8-Aqua-Gard-Thermostatic-4-Port-Mixing-Valve-Lead-Free-Compression

hot_rod

Caleffi SinkMixer 3/8 compression connections

ChrisJ

hot_rod said:

Caleffi SinkMixer 3/8 compression connections

Even better, that has a much nicer connection pattern and a way to mount it.

ChrisJ

hot_rod said:

Caleffi SinkMixer 3/8 compression connections

It is surprising how much pressure drop these valves cause at 1.5 - 2 GPM though.........

16 PSI @ 2 GPM?

JUGHNE

Some years ago I was working in a private home/day care.
Most of these are inspected by the State for safety issues.

On the sinks there was a different aerator installed.
It was temp limiting and would close up if that temp was reached. It would auto open again after cooling off a little.
Never saw any again nor a source.

Disadvantage was you had to mix H&C yourself to keep the water on......not a bad learning process for toddlers.

With pre mix under the sink or elsewhere, you just turn on the HW, never mix perhaps. Not necessarily good as you go to a non tempered HW supply expecting it to be safe and get surprised.

kevintheplumber

You could get a faucet with a built-in temperature limit stop. The only brand I know of is Wolverine brass, But they only sell to licensed plumbers there may be other brands that I am not aware of

BillyO

sloan makes a 3/8" OD compression mixing valve . they are used with their touchless faucets. They are sold separate also. very simple install under existing sink