Potterton PTT1 Cylinder Thermostat

[mikep6dd]

I have one of these on my hot water cylinder and it has lost its calibration.
It is a discontinued product and has been replaced by model PTT2, which requires a live feed to run it, to which I don't have easy access in my airing cupboard.

Does anyone know from where I can still get a PTT1, or can anyone recommend a direct replacement from another manufacturer? The Honeywell L641A1039 has attracted my attention and I'm currently asking Honeywell if it would be suitable.

 

[mikep6dd]

In the absence of any information re the sourcing of a PTT1, I have purchased a PTT2. I have discovered that the feed to the motorised valve in the airing cupboard is indeed a permanent live.

 

[45yearsagasman]

Fit the L641 straight to your cylinder. Its mechanical and requires no perm live. If you have S plan then very easy wiring.