"Dave Plowman (News)" wrote in message
...
In article ,
Stephen wrote:
I would have thought a plastic tank would melt at high temperature

Aren't many kettles plastic?



Indeed. There are also many different types of plastic. If the OP is
concerned he could have a galvanised steel header tank - if you can buy one
nowadays.

If you keep putting heat into a presssurized system, the pressure will
increase and the water will quite probably just boil at a higher
temperature. The conseqencies of any subsequent failures will likely be that
much worse. Hence the regulations regarding the boilers used in steam
engines!


--
Michael Chare