mains cold water and immersion heater - shower?

[Smrgol]

I'm currently planning to remove my existing bathroom with its elec shower and want to install a mixer shower with more pressure.

I have cold water direct from mains and hot water from an immersion heater (going to be upgraded to a duel immersion).

Now I have already found out that you cannot attach mains cold to a pump, can I put a pump on the hot supply and then attach both to the shower, or will i need a pressure equalising valve to make sure they match before they hit the shower?

 

[muggles]

It depends really on your mains pressure - if there's a small difference between mains and pumped hot then you can pump the hot only, if there's a large difference then you'll need to either fit a restrictor of pressure reducing valve to the cold (assuming the cold pressure is higher than the hot) or draw hot and cold off your loft tank and pump both sides

 

[JohnD]

You have an immersion heater?

Then I'd guess you have an ordinary cylinder fed from a cold tank.

If you want a pumped power shower it would be usual to take the hot from the cylinder, and the cold from the cold tank. No pressure regulation required, but maybe pipe runs changed.

If the tank is small you may want a bigger one as power showers are quite greedy.

 

[Smrgol]

Hi, thanks for your replies.

Its an all elec single immersion heater.

The cold has no tank it is straight out of the ground, through the meter and into the pipes lol

 

[JohnD]

Its an all elec single immersion heater.

this is an immersion heater

it fits in a hot cylinder like this

which is fed from a cold tank.

in the loft
or sometimes a small one on top of the cylinder

What have you got?

 

[Smrgol]

not one of them

What I have, which is not the original for these buildings, is a Heatrae Sadia, cistern type FBM.

http://www.heatraesadia.com/hs/heatraes.nsf

As the houses have flats on top we dont have lofts for normal tanks etc to sit and there are no other tanks above the white one above

 

[JohnD]

I think we'd call that a Storage Multipoint Water Heater and not an immersion heater.

It might not be able to supply enough hot water for a power shower.

Try to workout which model you have got (the dimensions or maker's plate will help) and therefore what capacity it has.

http://www.heatraesadia.com/HS/Heat...79E53D0D33D802569440046E425/$file/fbm_new.pdf