My shower is only running luke warm water. What could be causing this?

Question

The water temperature on the boiler is turned ot max. and the water from the other taps in the house are producing water that is boiling hot. Could it be the mixer tap on the shower?

Answer 1

You need to clean or replace the hot-cold mixing valve. The hot side may be restricting the flow.

Answer 2

If a thermostat in a shower fails then for safety reasons it must fail safe and ensure that the water cannot get through and perhaps scold. It sounds like a thermostat failure. The other possibility is that the incoming water is far to hot and the shower pump, if you have one, is cavitating. That is because the incoming water is closer to boiling point the pump has a negative pressure at the inlet which effectively lowers the water boiling point and it turns to steam. This steam locks the pump and only a slow dribble of water can get through. Try turning down the boiler and the hot water thermostat.

Answer 3

It could just be that the cold water supply to the shower is extremely cold at this time of year ! My electric shower suffers this problem, in winter I have to turn the temperature way up, in summer way down.
However if that's not the case it could also be limescale build up in the mixer valve is holding the hot water supply partially off. Again, my old Mira shower did that, the hot supply would get stuck off and the shower would always be cold until I turned it off and on again a few times at which point the limescale cleared and the temperature went up again.

Answer 4

I would say that your faucet is going bad. The water is mixing in the faucet, a little warm with the cold. You can spend money on a new faucet and replace that or replace the internal parts on the warm side. If you have a two handle faucet, then there are other issues. The faucet you have most likely is a one handle. Turn off you water under the sink both valves, and look at your faucet, There is most likely a ring there with grooves. Remove the top part of your faucet by unscrewing the ring. Once removed see what it takes to remove the inner guts and take that part to a hardware store and buy a rebuild kit or a replacement valve. Replace and put it back together.Time involved, 15 minutes. Cost $5.00 to 30.00

Answer 5

If the other faucets in the house are doing that too then the problem is with the aquastat at the boiler.

If it is just the shower then the mixing valve of the shower may be defective (jammed or stuck in its safety position) or turned down too low.(by external control or inner stops). Look at the instructions for that valve or look on the Internet for manufacturer instructions or even call the manufacturer.

Answer 6

Ounds like that's about all it could be. If hot wter is being produced at other faucets, it's not the hot water heater. Short of a blockage to the hot water line running to your shower, it has to bb the mixer at the shower faucet, especially if the shower has a single-tap, single handle set-up.

Answer 7

There are several things that may be wrong. If you shower is the only place where you have this problem, then it's your shower valve. If your water is lukewarm from all the taps in the house, one of your hot water heater's heating elements may have burned out or one of the thermostats is bad.

Answer 8

Lukewarm Shower

Answer 9

How funny! Not the fact that your shower is cold, the funny thing is that the exact thing is hapening to me, and I am at this very moment waiting for the boiler maintenance person to come around andfix it....so far 2hrs 15mins late!

Good luck,
mrben

Answer 10

if its a single handle shower body take off the handle you can adjust so you open more hot water
it is set from the company to a low temperature for the kids