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what is the raysheo of anti freeze for an espass diesel heater for my central heating on narrow boat thanks

Asked by: janet alderson  | 8.40pm, Tuesday 17 September

WW says:

The central heating system on a boat needs to be filled with antifreeze just like a car; this stops the water freezing solid and damaging the boiler, pipes, calorifier, or the radiators, if the boat is left without heat for long periods in the winter.
The heating system should be filled with a 50/50 mix of the ordinary blue ethylene glycol antifreeze (which is easily obtained from car accessory shops), and water.
Boats are generally supplied with the antifreeze in the heating system, but evaporation and time will diminish the effectiveness of the protection. Testing kits can be purchased to check the concentration, or a simple test if you have a freezer is to dip a cotton bud into the expansion tank; put it in the freezer overnight and see if it has frozen or not (keep it away from any food).
The heating system on a boat will typically contain between 15 and 25 litres. If there is no antifreeze, the system should be drained, and re-filled with the pre-mixed antifreeze solution to ensure even distribution round the system. If the concentration just needs boosting a bit, top up the expansion tank with a strong mix (say 75/25, but not neat antifreeze) instead of water when it is low.

Rupert Smedley  | 9.34PM, Tuesday 17 September

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