Shower with cold feed from tank and hot feed from combi?

[Scoboblio]

Good evening everyone a couple of years ago we had our old style boiler replaced with a combi, but kept the cold water tank in the loft to feed the cold water to the shower (pumped), with the hot water coming from the combi.

Recently the shower packed up and I've since been told that we should have changed it for a mixer when we had the combi installed, as combi boilers and pumped showers don't mix well! So now I'm looking at a mixer shower as a replacement, but will I come across any problems with it getting it's cold water from the tank, but hot from a combi?

Thanks in advance for any advice.

 

[Terry lambert]

You will have unequal pressure and so would be better off converting the cold to mains

 

[Scoboblio]

Thanks, would i need to put in an expansion vessel if i was taking the cold feed directly from the mains? Would the uneven pressure from the tank (if i were to leave it in) be likely to cause problems? Thanks for the help

 

[calorific]

Thanks, would i need to put in an expansion vessel if i was taking the cold feed directly from the mains?

No

Would the uneven pressure from the tank (if i were to leave it in) be likely to cause problems?

Yes

Pretty trivial to convert the shower pipework to mains - just tee into the cold supply pipe to the cold water tank and connect to current pipe. To be honest, it's just as easy for all the cold water to be mains fed now.

 

[Scoboblio]

That's great, thanks

 

[Terry lambert]

Yes it could cause problems.

You wouldn't need to fit an expansion vessel, just link the cold main feeding the tank to the outlet on the tank.