merryfisher 925 calorifier

Ripster

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20 Oct 2008
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Torbay
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I run a small 60w tube heater next to mine (the cal) that comes on at the same time as the main engine room tube heater and the cabin oil rad. First time I have tried this as I too was worried about the cal and all the pipes around it. It worked a treat and does not cost much more to run. This as well as releasing the pressure by running the taps and leaving them open with the pump off.
 

David of Essex

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4 Feb 2008
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I have a 925 and for the last 3 winters have drained the cal and making sure the pressure relieve valve is open, touch wood is ok this time.
David
 

Scubadoo

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16 May 2001
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Hampshire / Solent
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I keep two tube heaters on a theromostat in the engine bay, and as Ripster has said, leave the taps open to reduce the risk.

It has worked for me for many years and I don't bother draining the system down as I use the boat during the winter.
 

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