Electric showers

[Renton]

Evening all
Quick question as i have noticed that since we have had good weather my electric shower (10kw no pump) is performing much better, meaning that i can turn the temp setting down giving better flow rate. The only reason i can come up with is the higher ambient temps of the mains.

So with this in mind can i add a hot water supply to my electric shower using a solonoid valve fed from the shower output just to bring the average temp up slightly? I would think that a one way valve would be required to stop the mains pressure "back filling" the hot water system so i guess my question is do one way valves work on the the pressure differential placed upon them so if the mains was at a higher pressure it would not allow the hot water into the shower?

Just reading the post back and thinking about it seems its a non starter but worth the question?

TL: DR
Can I add hot water to my electric show even though the pressures are very different

 

[Renton]

not really because the pressures are so different, I could put in a pump set to try and balance them but they are quite expensive and noisy

A simple solonoid and oneway valve is about £20 and a pump set about £150-200, its not a really big deal but i just thought if i could improve the showers performance by adding a bit of hot water while i have the plumbing exposed it would make sense

Edit: I live in a flat so the water tank feeding the hotwater system is at a fairly low level meaning low hot water pressures compaired to mains

 

[Renton]

No no no, definitely don't do that, it could go wrong in so many ways man.

Do it properly or don't do it at all.

TBH i dont think i am going to do it purely for the reason that to be compliant it is going to need two check (one way) valves, and i dont think this would work with the pressure difference

But out of curiousity could you name a few of the many ways this could go wrong?

Cheers