Stephen wrote:
On Thu, 20 Aug 2009 04:18:22 -0700 (PDT), NT
wrote:

When replacing a heater you should have the tank full initially, once
its loose then turn tap on and water supply of to drain it.

But don't they drain from the top? I thought cold water went in the
bottom and hot water came out the top?

Is there a reason that butyl cables are used with immersion heaters? I
know they have to be heat resistant but why not heat resistant PVC? I
no such thing

There's both he
http://www.tlc-direct.co.uk/Main_Ind...ant/index.html
Turning on a hot tap will not drain the tank. Turn on or opening the
drain cock will.
There is no need to remove the element to change the thermostat.
If you are not using the top heater then why not swap the stats over for
now and get a replacement at your leisure. £6-7 from toolstation and you
are bound to find something else they sell to get to the £10 post free
threshold. Maybe even buy 2 to get the protection of the new type on
both your heaters?

Bob