Truma dump valve operating temperature. (1 Viewer)

[Gingernuts]

What temp should this truma dump valve work at?

 

[Phill D]

I believe ( without looking it up ) it’s at 5’c

 

[Gingernuts]

Silly me thought that frost protection was at freezing point doh!
That’ll explain why I can’t keep water in my van water tank in Scotlands tropical winter temps!

 

[hja]

I thought it was 4C. But same principal.

 

[Lenny HB]

Depending on the type the newer mechanical ones with the blue button & knob 3°, the old electrical ones with red button 5°.

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[The Old Man]

I have no idea but mine drops before freezing.

4°C makes sense though.

At 4°C water is at it's highest densest, which is why ponds and lakes rarely completely freeze.

In your boiler, once the water is at 4°C it will expand if it gets warmer or colder, and it is the expansion which is the danger to the boiler tank.

The densist liquid in the tank will sink to the bottom, so it could be that you have an inch of 4°C water at the bottom if your boiler tank, with the water above it at 0°C and frozen. So you inch of 4°C water will expand whether it gets warmer or colder. With a frozen layer above it, it has no where to go as it expands except to split your boiler tank.

 

[Tombola]

Council gritters send out the lorries if the temp is predicted to 4 or below

 

[Russell's Dad]

As Lenny HB says. The blue ones dump at 3 degrees. They won't reset until it gets up to 7 degrees.

 

[scotjimland]

if it opened at 0 c .. nowt would come out ..