I asked my plumber to increase the temperature of the my tub faucet and he did. However the next time I took a shower the temperature could not get above 90 . The tub faucet was 115. I took off the shower head and the temperature coming out of the shower pipe was the same as the faucet 115 . The plumber recommended a new shower head . The new shower head , a basic moen shower head same problem. Called plumber, he told me to take out the small black washer with a screen in my shower head . Did that no change in temperature still 90. Water flow rate of the new Moen showerhead 1.8. Any ideas
Cold shower ,hot tub faucet
- Thread starter Celtic
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Pictures of the valve, tub spout, and shower head would be useful. Is the tub spout and shower head controlled by the same valve? Is your water heater tank or tankless? What temp does the water reach at the sink faucet? Rest of the house?
pasadena_commut
Well-Known Member
Sounds like back pressure from the shower head is affecting the mixing valve for the tub/shower. (Either that or there isn't one, but then what did the plumber adjust?) The tub faucet is wide open, so no back pressure. If this is what is actually happening then the temperature out of that faucet should fall (eventually) if you block that outlet partially. Placing your hand over the faucet tightly might be sufficient - but be prepared for water to squirt out all over the place. Anyway, that simple experiment should confirm that back pressure is causing the problem. Modern plumbing uses a temperature regulating valve which I would not expect to vary the output temperature when it encounters normal amounts of back pressure. Perhaps the one the plumber adjusted is defective? Maybe that is why he had to adjust it in the first place?
