Cylinder Thermostat

[scuzzle]

Hi folks,

I want to fit a cylinder stat to my hot water cylinder as for some reason it doesn't have one, but the cylinder is coated in a sort of foam insulation. Presumably the thermostat would need to make direct contact with the cylinder metalwork. Is it just a case of cutting/piercing through the insulation?

Thanks fir any help. J.

[Andrew Gabriel]

...but be very careful. The copper underneath can be unbelievably thin.

[shazzbat]

He's right. I'm told it can be as little as 0.2mm

Steve

[shazzbat]

I meant to add I was told that by someone who accidentally cut one open with a stanley knife :-))

[Paul Saunders]

[scuzzle]

Thanks for all the info folks. I could probably cut into the insulation with something blunt made of plastic to save having a DIY disaster of the worst kind!

I imagine there will be some instructions with the thermostat when I buy it indicating the best positioning for it. From what I can remember they are usually positioned about half way up the cylinder.

J.

[fred]

In article , scuzzle writes

Usually about third of the way up, higher & the tank is half empty before the stat realises it needs a top-up, lower and the boiler is cycling every time you fill a sink.

I cut the surface of the insulation with a stanley knife then scooped out the foam with something blunt. Probably not necessary but I put some copper based thermal grease on the back of the stat capsule to get a good contact with the cylinder and cut a little groove in the insulation near the stat to let the expanding wire fixing strap push it right onto the surface.

[scuzzle]

Thanks for the info Fred.

J.