My house is some 30 years old now. From new, the CH header tank had a
plastic cover over it with integral insulated panels hanging down all
4 sides. Apparently these can no longer be obtained.
Last summer, the overflow pipe discharged and unfortunately dumped a
lot of the water inside the insulated panels, ruining the cover (I
have since elongated the overflow pipe so that this cannot happen
again. I have wrapped the sides of the tank in a purpose built
insulated plastic cover but the only insulated cover I could get was a
simple flat one of similar material, which requires its own tank cover
beneath it to support it (otherwise it would just fall into the
I've constructed a cover out of painted (breathable) plywood, with
ledges all the way round to prevent it moving sideways, that fits
snugly round the top of the oblong tank. I've permanently fixed two
elasticated straps to the top of the cover under which the insulated
panel can fit.
On checking the panel a while ago, I found the under surface of it
saturated with what I assume is condensation. I also seem to remember
that the original plastic cover ended up like this as well. I've tried
to alleviate the problem by raising the cover about 12 cm all round to
allow the ventilated loft air to circulate under it to some extent,
but this has made no difference. I'm obviously concerned that if left
in that state for any length of time, the plywood cover will
eventually be adversely affected, despite being painted.
I plan to re-paint the lid in deck paint for added resistance to the
condensation and have also considered making one out of 1"
polystyrene, but strength may be a problem.
Does anyone have any answer to this problem. Can insulated plastic
covers similar to my original still be obtained? Also, will the under
surface of the cover always be saturated in condensation - presumably
particularly in the colder months?
On 19 Dec 2003 05:56:35 -0800, firstname.lastname@example.org (Mike Penk)
There is a much simpler solution.
These tanks, covers and jackets are very cheap - you can buy all three
for a fiver, or separately.
stock codes 11445, 11446,11447
Your local plumber's merchant should have them for the same or little
With a vented CH system, the water often becomes warm, depending on
how far the feed pipe from the bottom runs before it reaches the
primary circuit pipe. Expansion of the water takes place up this
pipe, so dependent on volumes there may be some warming of the water.
THis will lead to water vapour which will tend to condense on the
underside of the lid put should drip back in - and is normal.
What you should check for though, is that the system is not pumping
over. This is where water is flowing out of the vent pipe and into
the tank. In that case the water will become hot, of course, and
this is not desirable because you will introduce dissolved air into
the system and promote corrosion.
The reason for this, if it happens is too great a pressure
differential between the feed and vent pipes and is either because
they are connected incorrectly to the circuit (should be at points no
greater than 150mm apart) and/or because the pump setting is too high.
To email, substitute .nospam with .gl
Sort of. The water will still expand into the f&e tank and the level will
rise. Depending on the capacity of water in the feed pipework between the
tank and wherever lower in the system the water is hot, warmed water may not
rise to the tank. You could run your feed pipework in 100mm to ensure this
However if your tank is well insulated and fitted with a lid which is not
affected by condensation (and does not allow it to run off over the edges of
the tank) then the warming of the water in the tank should not be a problem.
I read a book on improving your memory but I've forgotten what it was
Hello Andy and thanks for the reply.
I have contacted the web site you mentioned and am awaiting a reply.
The header tank they offer is very nearly but not quite the same
dimensions as mine. I therefore doubt that the lid they offer will
Without the lid, unless the insulation product they mention forms a
cover as well as insulating the sides of the tank, I'll be back to
square one and will have to persevere with the lid I've made.
It has occurred to me to see whether the makers of my tank are still
in business. They may be able to help.
I've now had a reply from the web site you mentioned and unfortunately
the lid of the tank they offer is just too small to fit my tank. Also,
the insulation kit they offer is simply a wrap-around for the sides of
the tank, which I aleady have, and a simple flat top which requires
the tank to have a lid.
I'm not even contemplating replacing my tank, so I shall have to
persevere with the lid I've fabricated, painted with deck paint.
Thanks for your attempted help, anyway.
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