Plumbing Question - Shower not hot

[Mike Johnson]

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Anyway like I said I feel I've been put on the right track - for some reason the water entering the pump isn't very hot, unless I use the Immersion. I think I'll measure the temp(i.need a thermometer) and just go to the company that fitted and say look this is the temp here's what I found, fix it.

Have you tried turning your tank stat and boiler temp up ?
The tap hot water temperature is going to be the same as the immersion tank

 

[Mike Johnson]

I have in the past cured a very strange temperature difference by turning on all the taps in the bathroom, seems that if I have been working on the plumbing I sometimes get an air lock and this cures it, have you tried running the shower without the thermostat in place for a while and then carefully testing the water temperature?

 

[Mike Johnson]

Have you tried turning your tank stat and boiler temp up ?
The tap hot water temperature is going to be the same as the immersion tank

He has hot water at the taps, it's just not hot at the shower pump.

That gives me a thought (lonely I know) is there a temperature compensator fitted on the flow to the shower, one that mix's hot and cold water? something like this: Water Valve Control Pipe Replace Supplies Tap Temperature Thermostatic | eBay - https://www.ebay.co.uk/itm/285144708639?

 

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The only thermostatic mixer is going to be in the shower mixer bar
He could just fit a mixer that’s not temperature controlled

 

[DPG]

Just have a bath. You must stink a bit by now

 

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Just have a bath. You must stink a bit by now

He will be ok it’s not his.

Anyway cold showers are good for you and cheaper to run.

 

[Mike Johnson]

The only thermostatic mixer is going to be in the shower mixer bar
He could just fit a mixer that’s not temperature controlled

Not now days with the mains pressure hot water system being fitted in most new builds, the thermostatic temperature mixer is almost mandatory.

 

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Not now days with the mains pressure hot water system being fitted in most new builds, the thermostatic temperature mixer is almost mandatory.

He hasn’t got mains pressure on the hot side it’s header tank fed (vented) hence the need for a shower pump.

 

[brianmoooore]

I sometimes get an air lock and this cures it,

The only place there could be an airlock is before the pump. The pressure after it would overcome any thing like that.
Is the length of pipe that includes the gate valve running downwards slightly as it goes away from the cylinder, or at least horizontal?
A surrey flange has a small hole internally between the top of the shower dip tube and the rest of the hot water/vent outlet. A blockage of this hole is likely to cause airlock problems.

Not now days with the mains pressure hot water system being fitted in most new builds, the thermostatic temperature mixer is almost mandatory.

TMV is mandatory on the supply to a bath. Water from a bath tap must not exceed 48 degrees, which must waste loads of water, since you can't just top up the temperature of your bath with a bit of 65 degree water. You now have to partly empty the bath and top up with loads of 48 degree water.