Where to put my header tank

[Kelbs]

Hello lovely boaters,

 

I'm most of the way through installing my heating system, I have a 75L calorifier which will be heated by the Webasto Thermo Top C. The Webasto will then go on to heat a load of rads. 

 

My question is, does the header tank have to be at the highest point. I fitted it without giving any real thought and now after thinking about it I would imagine it needs to sit higher than the highest radiator. Is that right or can I get away with having it around 30cm lower than the highest point in the system.

 

The header tank is currently in the engine bay, nice and out of sight. I will have to move it inside the utility room if it needs to be higher, no real issue just a pain in my arse, a pain I would rather avoid.

 

Help is much appreciated.

Beau

 

[Flyboy]

It needs to be as high as possible above the highest point of the system. It won't have any head if you mount it below the highest point in the system.

[stegra]

It's possible to have the Webasto in a sealed pressurised system but it sounds like you might be too far advanced in your installation to consider that now. 

[Paul C]

Yes, unless you want to go through a complete royal pain-in-the-arse procedure to fill the system and have no way to actually check the coolant quantity etc....

 

What type of stern does the boat have?