I have a single handle shower in my basement that is too cold in the winter. I only need a small adjustment, but I don't know if it's even possible.
The "hot water stop" appears to be already set to max. The following image is from the manual:
My current setting is all the way counter-clockwise. I tried turning it clockwise for science, and it makes it colder.
What is the most proper solution, given standard plumbing technique and so on?
1) I see that there are screw-valve things to either side of the handle base. They both appear to be turned fully counter-clockwise (There is strong resistance in that direction). Someone implied that it's okay to try tightening that. Tightening the cold water screw three half turns appears to have warmed the shower some (hard to say because it varies with weather and such). Regardless, shouldn't this be unnecessary? I wonder if something else is not working properly?
2) Turn up the water heater, which is at factory default. Note that I don't feel this should be necessary, as water coming from the upstairs shower is warm enough, and the sinks can get way too hot. Plus I worry about the dishwasher etching my dishes.
3) Something else?
There are no valves outside the shower that could restrict the water in, (hot or cold) besides the main cold and water heater input valve. The water goes from the basement utility room, to behind the shower, then split off to the bathroom sink and end there.
Both pipes to the bathroom, when unused for houses, feel about room temp. They don't rest against any surfaces that would cool them down.
I have city water. The plumbing is of unknown age. The house is from the early 60's. The pipes are all copper. There is about 25ft of pipe from where it enters the house to the water heater tank. Then another 20ft to the back of the shower, the last 10 feet or so are 1/2".
The shower handle, going from "Off" position to "Hot" appears to ramp-up in a non-uniform matter. So as I start turning it, it goes to something like 20% warm, 40%, 60%, but then goes back down to 40%, then 60%, 80%, 100%. It does this regardless of the screw-valve's being fully opened or not.
Is this a faulty cartridge, or something else? ...And would that be the cause of the shower not getting warm enough without restricting the cold valve?