Calorifier losing heat to engine!

[Oily Rag]

My Beta has the usual connections to the calorifier to produce hot water. But the engine is slightly above the calorifier, so when the engine is shut down, the calorifier sends a reverse flow to the engine. It keeps it lukewarm overnight but leaves the water rather tepid in the morning.

Can anyone recommend a spring loaded non return valve for fitting into the pipe work from the engine? I'm thinking of something from a plumbers merchant that could be fitted to 16mm/5/8" heater hose.

 

[HughClayton]

Suggest that you don’t need to do anything…… the engine coolant that flows from your engine into your calorifier to warm up the water isn’t going to flow when the engine, and coolant pump, is stopped.

It’s likely that the water in the calorifier is just cooling down naturally overnight.

 

[Boater Sam]

As you have 2 threads I'll post here as well.

All you need is a loop in one or both hoses to the calorifier higher than the top of the engine to stop the gravity circulation.
If the hose is the high point rather than the engine you will have no problem.
Conversely taking the hoses as low as possible near the calorifier, lower than the coil connections, will do the same job,