Shower piping hot for 10 seconds, then just warm

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Our shower is piping hot (nice) for 10 seconds or so, then the temperature reduces to just warm. Considering that, in this current weather, we have the heating (gas) on most of the time, we thought that the water should be piping hot. The water in the taps is piping hot. It's just the shower that isn't. What could the problem be? Thank you.
 
try cleaning out the shower head, it could be full of grit or limescale, I know that affects mine sometime and the temperature as a result (and I don't know why) goes a bit all over the place, once I've cleaned out the head, it's grand
 


This type of prob is usually only associated with electric showers - particularly during cold weather.

Is the shower head connected to the same unit as the taps (from which you're getting the piping hot water ?)
 
gianni said:
This type of prob is usually only associated with electric showers - particularly during cold weather.

Is the shower head connected to the same unit as the taps (from which you're getting the piping hot water ?)
Click to expand...

No the shower is a separate unit (a Triton). It's not connected to the bath taps. (The shower is over the bath). All the taps give piping hot water (bath taps, wash hand basin, and kitchen taps). I will try cleaning the head but it's not that long since I did that.
 
This is normal. The shower is piped from the cold mains water supply. The unit has to work harder when the water in the mains is cold. The initial hot burst is hte result of the warmer water already inside the house.
 
What model Triton are we talking about . Is it tank fed or mains fed, electric or mixer ?
 
W200 said:
What model Triton are we talking about . Is it tank fed or mains fed, electric or mixer ?
Click to expand...

Sorry, it's not a Triton (doh!). It's an Aquastream. It's electrically powered. It's fed from the tank (which is upstairs). The shower is on the ground level. The water in our house is heated by gas. We have GFCH and gas for cooking also, and so all our hot water is heated by gas. I hope all of that makes sense. I'm not at all technically minded (you might have guessed that!). Thank you.
 
It's fed from the tank (which is upstairs).
Click to expand...

Assuming it's fed from the cold tank, your shower unit has to heat the water from cold. So the GFCH isn't relevant. extopia's explanation makes sense.
 

It is not clear from the posters question whether the shower is simply a pumped shower from a hot water tank or an electric shower however we had a similar problem and it turned out to be an anti-scald device on the hot water feed for the shower that was malfunctioning. When we turned the shower on the water was very hot and this was causing the anti-scald to close off the hot feed causing the shower to run cold. After half an hour then the shower would run OK. The solution was to adjust the setting on the anti-scald increasing the limit temperature from 40 degress to 50 degress then all was OK.
 
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