central heating

[Maurice Hood]

Am having an extension into the loft. How high should the bottom of the expansion tank be above the top of the highest rediator?

[Grunff]

As high as you can get it - the higher, the easier to bleed. If you can manage a couple of foot (60cm), that works very well.

[John Rumm]

Any chance you could convert to a sealed system? Saves loads of hassle in this circumstance.

[gasman pete]

system, These work better and you dont need a feed and expansion tank just a small expansion vessel. pete

[Roger Mills]

Provided your boiler is suitable, why not take the opportunity to convert to a sealed (non-vented) system? Then you won't need an expansion tank at all.

[Ed Sirett]

The expansion tank should (boiler permitting) be dispensed with altogether. See Sealed CH Faq.