Well, I was going for a heatbank or thermal store

[bludger]

but I've read all the threads on this and they have changed my mind.

We have a direct economy 7 water heating system. I need a new cylinder and would dearly love to get the cold water tank out of the loft. Hence the idea of a heatbank.

So, what about a combination cylinder, called a fortic I think, placed downstairs. We have the room. We have about 3 metres of head at present which is quite adequate to serve our single shower and taps. Would a low pressure pump with a flow switch make up for the non-existent head if I used the fortic?

Too powerful a pump would empty the cylinder quite quickly if my wife got carried away in the shower. I'd like a 210 litre cylinder - what size top tank would be needed to match that?

If the outflow did exceed the inflow from the cold mains, what would be the consequences?

The cylinder is in the middle of the bungalow but the overflow from the top tank could be fed through a cupboard and the bathroom to the outside.

If someone could advise on this idea I'd be very grateful

 

[Hufty]

Have a look at direct unvented cylinders - might be what you're looking for if your mains pressure and flow is good enough.

 

[bludger]

Yes, I'll do that. And have the pressure and flow of the water tested, too.

Thanks for that.

Happy Christmas.