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AuthorMessage
Barmpot
Barmpot

Posted: Tue Jan 24, 2012 5:08pm

Post Subject: Heating

Is it possible to run a Webasco heating system and a Squirrel back boiler system together?

Tony-B
Tony-B

Posted: Tue Jan 24, 2012 5:33pm

Post Subject: Heating

Sorry to be an old grump but once again this question is so short on what is in the questioners mind if I took it literally the answer would be "yes". This is because there would be duplicate systems, each with a different heat source. However I suspect the questioner really wants to know if one central heating system can be heated by the two different sources and the answer to that is far more complicated - or was the meaning "can a Webasto and Squirrel both be used on one system at the same time. Lets assume two heat sources, only one of which will be in use at any time, feeding a joint set of radiators. Stoves have a nasty habit of running away and boiling the central heating coolant. IF near boiling water was fed into any of the Webasto types of heater I would expect a "backstop" overheat device to trip that may render the Webasto inoperable. It is for this reason I would suggest that if you are going to do it you will need a "pass through" (centrifugal) central heating pump for use when the stove is in use UNLESS you make the whole stove fed part of the system circulate by gravity (convection) and than a two way valve that will allow you to isolate either heat source from the other. The Webasto water pump should pump through a gravity system. You could also think about using a heat exchanger on the Webasto output heating the boiler circuit but that may well imply a second pump. If you can run the Webasto pump with the boiler part turned off then it might work if you put the Webasto in the return pipe from the stove and fed hot water from the Webasto through the unlit stove to the radiators but you would lose some heat up the chimney. It is possible but it needs careful consideration to see if the extra complexity is worth it. Also check to see if doing this would invalidate the Webasto guarantee.

Veggie
Veggie

Posted: Wed Feb 01, 2012 9:50am

Post Subject: Heating

We have a Webasto at the rear of our 70ft boat and a Bubble stove with boiler at the front, we have a 12v Jabsco circulation pump which is switched on when we are using the Bubble, it pumps hot water around 6 rads and a towel rail. Never try and use both at the same time, as well as confusing the Webasto they pump in opposite directions. Never forget to switch the Jabsco pump on when using the Bubble else you will be clearing up a lot of water/antifreeze which will be blown out of the header tank. To get the rads hot using the Bubble from cold takes around 2 to 3 hours so it's works best if you have it going 24/7. We have fitted an isolation valve on the Bubble so in the warmer months when we use the Webasto for an hour or so in the evening it doesn't heat up the Bubble.

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