Hi, and thanks for helping.
I have a home with an oil fired steam furnace that was installed in 2003. At that time I also had the oil company install a tankless water heater system.
At the current moment I am having problems maintaining a desireable temperature when taking a shower. Here are some details (please let me know if I should capture others):
Maintenance Temp of Boiler: 180
Water Pressure: 75psi
Water Supply Pipe Diameter: 3/4"
Hot Water Outlet Diameter: 1/2"
Temp at kitchen Sink Faucet: 120 - 130
Temp at bath sink faucet: 119-124
Temp of Shower: 105-114
Shower Valve Type: Single Handle Symmons
Anti-Scald Stop Setting: Open
Basically the issue is that the hot water coming out of the sinks is almost too hot and I am worried about accidental scalding. However, if I adjust the boiler to where the max faucet temp is 115, the shower temp is horrible. The shower valve is brand new and was just replaced. The stop screw is set so that the water handle can be turned to the fully open hot position.
I am stumped as to what is causing this and how I can rectify this. I would like to have the faucet temp be around 115 to 120 and the shower between 125 and 130.
I have had the oil company back out to check their mixing valve and they say all is well. They point to the anti-scald valve, but my plumber says it is not that.
Any advise would be appreciated and if I need to collect any other details to help please let me know.