Difference between thermostatic and pressure compensating shower valve?

[Marty1979]

I'm a level two trainee and wondered if there is any difference please? Not sure where I would source a pressure compensating shower valve from I. e. to install on a combi boiler system?

Grateful for any insight please or are these the same the same thing?

Cheers guys

 

[Ric2013]

Thermostatic mixes hot and cold to maintain a steady temperature. Usually on balanced pressures; some will run with gravity hot, mains cold and MIs only recommend without stipulating balanced pressures.

Prsssure compensating shower: could this be referring to the venturi type that uses the cold's pressure to boost the hot pressure and is specifically designed for mains cold, gravity hot? Never seen one outside of a textbook and no idea where I would buy one from.

 

[steadyon]

Ric2013 - look at the Ideal Standard "Boost" shower valve.

 

[Ric2013]

Seems to be discontinued, but yes, that was what I meant. I hope it is what the OP meant?

 

[Marty1979]

Thermostatic mixes hot and cold to maintain a steady temperature. Usually on balanced pressures; some will run with gravity hot, mains cold and MIs only recommend without stipulating balanced pressures.

Prsssure compensating shower: could this be referring to the venturi type that uses the cold's pressure to boost the hot pressure and is specifically designed for mains cold, gravity hot? Never seen one outside of a textbook and no idea where I would buy one from.

Thanks mate so am I OK to use a thermostatic shower valve on a combi boiler system?

 

[Chalked]

Thanks mate so am I OK to use a thermostatic shower valve on a combi boiler system?

Only if the vaLove is suitable and can handle th imbalance of pressures.
Most new ones are suitable.

 

[Marty1979]

Thanks Chalked so what shower valve would you use on a combi boiler please? Just thinking a manual one wouldn't work, right?

 

[Chalked]

Built in, or recessed.?
Any by Hans grohe . They are very good quality.

 

[Ric2013]

Only if the vaLove is suitable and can handle th imbalance of pressures.
Most new ones are suitable.

Shouldn't be much of an imbalance with a combi...

 

[Maryplumb]

The Mira 415 was a pressure balanced shower. Looking on Mira website looks like it may have last been produced in 2016 but not sure.
The pressure compensating was to cope with combi modulating not to balance unequal supplies

 

[chris watkins]

http://www.advancedwater.co.uk/STOMEMO/A520-144-0001/RWC Pressure Equalising Valve Spec Sheet.pdf
You could use one of these if there is more of a dynamic pressure difference between hot & cold than the shower valve can handle.

 

[chris watkins]

Aqualisa shower suitable for a combi boiler supply are good.

Manufactures often supply a flow restrictor to be fitted into the cold port of the shower valve to control the amount of cold water entering. This is less of a problem now the flow rates from shower has been reduced, this maybe why they have been discontinued.

 

[Vee]

If new bathroom, should be thermostatic to comply with BG Part G.

 

[DerekJB]

I'm a level two trainee and wondered if there is any difference please? Not sure where I would source a pressure compensating shower valve from I. e. to install on a combi boiler system?

Grateful for any insight please or are these the same the same thing?

Cheers guys

Hi Mira make a shower called a combi force 415 valve, this is a pressure balancing valve and not thermostatic, you can find it on there web site