PRV on electric shower??

[Tosh]

Hi guys,
got a mate complaining of his electric shower getting cold when toilet is flushed or cold tap turned on. I haven't touched the shower yet (weekend favour) and suspect there's crap in the filter at the shower feed in side,
but he has a PRV fitted to the mains in feed for the shower up in the loft.
Is there a reason for this or is it just from an older/different system before the elec shower was put in?

I just always thought electric showers ran totally off mains pressure and didn;t need reducing. Could be wrong as I have been many times before.

Ta muchly

 

[Mike Jackson]

Some manufacturers quote a maximum pressure so he may have high incoming pressures or it may have been someone being over cautious.

Mike

 

[buffy27]

Hi guys,
got a mate complaining of his electric shower getting cold when toilet is flushed or cold tap turned on. I haven't touched the shower yet (weekend favour) and suspect there's crap in the filter at the shower feed in side,
but he has a PRV fitted to the mains in feed for the shower up in the loft.
Is there a reason for this or is it just from an older/different system before the elec shower was put in?

I just always thought electric showers ran totally off mains pressure and didn;t need reducing. Could be wrong as I have been many times before.

Ta muchly

whats the craic,
determin what type of shower u have first.u can get gravity fed-like the triton t 90[fed from water storage tank at high level]this heats and pumps water as it passes through.[very popular in ireland.]there is also mainsfed showers - liked the triton t 80.this heats the water as it passes through.the adjusting dial speeds up or slows the flow across the element-heating it less or more.
i would say that there is no need for the reducing valve at all.maybe the origional shower was gravity fed hence the clever clog installing the p r v.
not good practice.
it malfunctions when other services are drawn offis it not over heating??? have a good suss around and get more details.
type of shower
history of shower and installation
pipe serving these services
main s pressure


if all else fails -reconnect the mains to the dhw overflow pipe,this needs to be 1 1/2 copper thus preventing reverse circulation/capillary attraction and pump over in the combi.problem sorted.listen, just send me a private question the next time u have a tricky one. it s unfair and confusing to the other lads - they don t understand the more complicated issues in plumbing.
p. s bout that shower. simply remove the fuzz gasket,take out the laughin pin, re- calibrate the giggling spring and replace the alcohol in the mercury thermostat.