On 26/04/2020 11:15, Kellerman wrote:
On 26/04/2020 10:56, Grumps wrote:
Hi All
Daughter has an unvented hot water cylinder in her flat which has two
3kW heaters. We believe (although I haven't checked as shouldn't
really travel) that the bottom (main) heater has failed and needs
replacing.
Apart from getting the correct length and thread diameter of the new
heater, switching off the electric to the timer, and draining the tank
- is there anything else I should look out for when doing the
replacement?
I have an immersion heater spanner already.

It's an Albion (now part of Kingspan?) cylinder, 170l Stainless
unvented, SU170D. I can't track down the heater part number which is
14P395 "STAINLES" (sic) but it seems to be a normal 3kW part. I assume
the thread is 1 3/4 but I don't know what the length should be 11" or
14".

TIA for any help.

It might prove a little difficult to undo and unscrew the faulty
immersion element. How old is it? Any sign of additional sealant or
corrosion? They can be very stiff to undo.


I replacd an immersion heater once, later for another reason the tank
failed and I removed it. For fun I then tried to remove the immersion
heater which was impossible without damaging the tank. Hard area. The
local scrap merchant gave me some money for the old tank after weighing
it. I always wondered how much of the weight was due to the hard water.

If I were the OP I would first make sure that I could buy a replacement
tank quickly and that I could then fit it as many of the connections
might be in a different position.

--
Michael Chare