: I'm putting in a whirlpool tub and want to improve the fill rate since it takes 66 gals. Since you use twice and much hot as cold in filling a bath, I'm planning on running a new 3/4" copper hot supply but keeping the existing 1/2" copper cold. I'd run the 3/4 hot right into the valve but use an adapter to fit the 1/2 cold into the valve.

: Is the thermostatic mixing valve going to work this way ? I've had different opinions where some people think the valve will not be able to compensate for the different volumes of hot and cold. None of them plumbers, though.

Kirk,
In these cases, I like to run 3/4" to both the hot and the cold. The larger pipes are quieter when filling. The cost difference between 1/2" and 3/4" is not even worth mentioning. When I use Roman tub valves, the 3/4" kind by Grohe, I use mini-resters for water hammer.

• Re: 3/4" Thermostatic valve fed by 3/4 hot and 1/2 cold ? Kirk Ellis 17:04:38 05/07/02(0)