Reducing the hot water temperature at the shower head

Calahonda52

The set up is a pressurised hot and cold system, with a 3 bar cold water pump fed from cold water header tank.
Hot water heated from a gas boiler via coil.

The boss is not happy with hot water temp at kitchen sink and I am not happy with it being too hot at the shower head for safety reasons with grandkids etc having showers and messing with mixer units.

Am wondering if I fit a Thermostatic Mixing Valve (TMV) on the hot after the flow to kitchen, and supply the TMV with cold from after the PRV, will this reduce the water temp at the shower head?.

If so any brand springs to mind and any other issues occur?
Thanks as always.

Sleeper12

Most shower valves have a way to set the maximum temperature. This would be the simplest thing to do.
Basically you'd be leaving the hot temperature as it is throughout the house & restricting the temperature at the shower only.

Calahonda52

Sleeper12 wrote: »

Most shower valves have a way to set the maximum temperature. This would be the simplest thing to do.
Basically you'd be leaving the hot temperature as it is throughout the house & restricting the temperature at the shower only.

Thanks, not these ones, they are Hansgrohe from about 15 years ago, before the more modern onto which you refer.

K.Flyer

Would it not be easier to just put the mixing valve on the main outlet from the cylinder and set it to your desired temp for all outlets?

Calahonda52

K.Flyer wrote: »

Would it not be easier to just put the mixing valve on the main outlet from the cylinder and set it to your desired temp for all outlets?

Thanks, that is in fact what I want to do but after the kitchen hot feed as she wants it hotter at the kitchen sink than i am happy with at the showers and hand basins.
At the moment I have the cylinder stat setting the hot temp for all the house.

ps
the plumbing is all very accessible so not hard to do once I get the correct rig.

K.Flyer

Look up Pegler-Yorkshire products for more domestic market or Rada-Meynell for more commercial based products.

Calahonda52

K.Flyer wrote: »

Look up Pegler-Yorkshire products for more domestic market or Rada-Meynell for more commercial based products.

Many thanks and in closing let me take the opportunity to wish every one here a great 2017 and thanks for all the help in 2016

youtheman

As far as I know for a mixer valve to work correctly the hot and cold water pressures need to be the same. Normally the cold water feed for the mixer is taken from the header tank in the attic, so the hot water needs to come from the same pressure source, i.e. from the hot water tank BEFORE the pump. If you connect the mixer valve downstream of the pump then you have hot watr at high pressure being mixed with cold water at lower pressure, and the 'mixing' won't work as the high pressure hot water will 'back out' the lower pressure cold water.

Then again, I could be talking total BS.

K.Flyer

Cold water storage tank >>> Pump >>> Cold Service & Hot Services (via Hot Water Cylinder = + / - equal pressures.