Pressure release valve leaking...still

[MtB]

6 minutes ago, Tony Brooks said:

Another think that looks a bit odd. Mounted on the left of the blue calorifier there is what looks like the PRV but it has  a sliver "something" fitted at its base and there seems to be a small plastic pipe or round cable coming from it. No idea what that is.

 

 

I'm pretty sure that will turn out to be a thermostatic blender valve, to limit the temperature of the water being sent to the taps to a safe value, e.g. 54c.

 

A calorifier heated by engine coolant can easily reach engine temp of perhaps 80c after a few hours of cruising, leading to dangerously hot water from the taps without the blender valve. 

[Tony Brooks]

Just now, MtB said:

 

I'm pretty sure that will turn out to be a thermostatic blender valve, to limit the temperature of the water being sent to the taps to a safe value, e.g. 54c.

 

A calorifier heated by engine coolant can easily reach engine temp of perhaps 80c after a few hours of cruising, leading to dangerously hot water from the taps without the blender valve. 

 

I did wonder about that but if so where is the PRV, and what is that  small tube thing?

[MtB]

 

The silver thing you mention is a flexible tap connector hose pressed into service, I reckon. E.g.

 

 

https://www.screwfix.com/p/flexible-tap-connector-with-valve-15mm-x-x-300mm/3558G?kpid=3558G&ds_rl=1241687&ds_rl=1245250&ds_rl=1249404&ds_kid=92700031521294317&msclkid=6b07d9dc7ce5122bea90b87761ea7ca8&utm_source=bing&utm_medium=cpc&utm_campaign=MPX_UK_SHP_MAN_S_ALL_Heating %26 Plumbing&utm_term=4583520379909349&utm_content=S - Plumbing&ds_rl=1245250&gclid=6b07d9dc7ce5122bea90b87761ea7ca8&gclsrc=3p.ds

[MtB]

4 minutes ago, Tony Brooks said:

I did wonder about that but if so where is the PRV,

 

No PRV in the photo as far as I can see. The thing we are looking at can't be a PRV as a PRV only has two pipe connections, not three. A blender valve has three.

[nicknorman]

Have a look here to see a naked surecal calorifier…

https://www.surejust.co.uk/55-litre-horizontal-single-coil-surecal-calorifier