Hot Water Tank Immersion Heater


M

mrwjw

Could someone please advise me on what sealant to use when installing a
new immersion heater in a hotwater tank...so that 1) it will seal and
2) it will be reasonable easy to remove in the future.

I have been advised to use boss white and silicon at different
times..thanks
 
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J

John

Could someone please advise me on what sealant to use when installing a
new immersion heater in a hotwater tank...so that 1) it will seal and
2) it will be reasonable easy to remove in the future.

I have been advised to use boss white and silicon at different
times..thanks
Boss White will set hard after a while and virtually concrete the threads in
if you use it to excess. Cured good quality Silicon is VERY tough to remove.
I usually put a couple of turns only of PTFE on the threads then a smear of
Boss white or Hawk white on the flat mating faces at either side of the
fibre washer. The PTFE prevents the threads seizing in whilst the fibre
washer provides the actual seal. Use a full (proper) immersion spanner to
remove and refit the immersion. Tap it to loosen and retighten, simple force
will buckle the cylinder.
Hint don't connect the cable until after you have finished and tested for
leaks as it will have to come off again to tighten a bit more if required)
 
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T

tony sayer

Richard Conway said:
I did this the other day. Mine came with a fibre washer and I simply
put a couple of turns of PTFE tape around the threads for luck (although
somebody will be along shortly to tell me I needn't have) and then just
tightened up. Don't overtighten while the cylinder is empty but wait
until you've filled it as the water makes the whole thing more solid
which helps.

I found that it weeped a bit when the cylinder was first filled, but I
managed to get about another 1/4 turn on it - I figured that when the
fibre washer got wet it become more compressible. Was fine after that
which was a relief as I didn't want to have to empty the tank again!
A smear of silicone on the gasket is all I've ever needed to use and
with that you don't have to wring it off and back a quarter turn to make
it watertight!...
 

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