What are the rules to take into account when siting a header tank for a
conventional pumped CH system. I haven't been able to find any hard and
fast guidelines .

I have had problems with heated towel radiators and tall bathroom rads
that don't get hot at the top and wondering if this is due to height of
header tank.

ALl other rads work fine.

The distance from the water level in the tank to the top of the tallest
radiator is approx 1 metre.

Would this be sufficient ? I have 13 rads and 2 heated towel rails
(heated off hot water circuit)

ANy advice welcome.

paul_j_tomlinson wrote:
I have had problems with heated towel radiators and tall bathroom rads
that don't get hot at the top and wondering if this is due to height of
header tank.

Have you tried bleeding the radiators?


The distance from the water level in the tank to the top of the tallest
radiator is approx 1 metre.

Would this be sufficient ? I have 13 rads and 2 heated towel rails
(heated off hot water circuit)

Should be fine.

The distance from the water level in the tank to the top of the tallest
radiator is approx 1 metre.

That should be plenty of 'head'. My header tank is slightly less
that one metre above my two highest radiators. They are always the
ones that accumulate the most air.

If you want to experiment, try attaching a piece of clear poly
pipe to your highest radiator and see how high you have to raise the
open end in order to stop the water from over-flowing. This will then
indicate the water height in your header tank. Oh, turn the pump off
first and don't scald yourself.

Chris.

The distance from the water level in the tank to the top of the tallest
radiator is approx 1 metre.

Provided you managed to bleed the rads until water came out, you are fine,
although limited head can cause other problems, like pumping over, in some
situations. It is possible that your system needs balancing. If other rads
are stealing all the hot water, some rads may not got hot all the way up.

Christian.

In article . com,
wrote:
What are the rules to take into account when siting a header tank for a
conventional pumped CH system. I haven't been able to find any hard and
fast guidelines .

I have had problems with heated towel radiators and tall bathroom rads
that don't get hot at the top and wondering if this is due to height of
header tank.

ALl other rads work fine.

The distance from the water level in the tank to the top of the tallest
radiator is approx 1 metre.

Would this be sufficient ? I have 13 rads and 2 heated towel rails
(heated off hot water circuit)

That's enough head, but you might have problems if the feed pipe from it
goes 'uphill' or has a long horizontal run. I'd expect the expansion pipe
would have to go quite a bit higher before curving down to the tank,
though, to avoid pumping over.

--
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Dave Plowman London SW
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