anti freeze for central heating systems

7 Dec 2008
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United Kingdom
I live in the frozen north of Scotland and frequently am away from home in the winter. I would like to ensure that my central heating system/radiators do not freeze when I am away (draining every time is a pain). Which additive will work down to -15c.. someone suggested car anti-freeze. Any advice?
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David937. Thanks...the cost seems to be somewhat large given the concentration required (estimate £200). Is there a cheaper solution?
The anti-freeze should be propylene-glycol. Don't try to save money by using cheaper ethylene-glycol (normal car type), if you have a leak between CH and HW, you may die.
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best bet is to drain down for long periods of absence. or have a frost stat WITH a pipe stat fitted, or easiest of all leave the programmer set to 24rs on heating and set room stat to 10 - 15 this will fire the heating when it gets cold preventing the pipes from freezing. Long term fix is to get the frost stat and pipe stat.
Thanks everyone...sounds like the frost stat and the pipe stat is the long term way forward
Anti-freeze will protect whatever. Frost stat only protects if you have power and fuel.

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