expansion tank height

Mark Eatherton1

you're dealing with an old open vessel type of expansion tank. If you convert to a newer closed type expansion tank with a rubber bladder, it doesn't need to be installed high. In fact in most cases, it's installed below the top of the heat source.

ME

Ed_11

I'm fitting a condensing boiler, the instructions say I must have 1000mm height above the boiler for the expansion tank and a 450mm height above the expansion tank for the vent pipe. As I'm trying to fit this all in my loft, I can't make these heights. Is there a way I can safely reduce these heights or will I have to reposition the boiler in a downstairs room. I have 1100mm from the top of the boiler to the roof.

Ed_11

thanks for the reply. I'll look into it. I already have all the tanks,pump etc from the existing system, does this mean that I'll have to buy a lot of new equipment like valves and pressure guages?

Aidan

sealed systems

See
http://www.rwc.co.uk/rwc/pdfs/training/qanov2000.pdf
about sealed systems.

You'd need a pressure gauge, filling loop, expansion vessel and a safety valve, if you don't have these already on the new boiler. If you're not CORGI registered you should have Building Regulations approval to install any heat producing appliance in the UK.

The noise made by the boiler may be intrusive if it's installed upstairs near your bedrooms. There is little background noise when the boiler fires early in the morning and the sound is much more noticeable. It may wake you up.