All hot water heating systems fuelled by oil or gas should be protected against freezing by the installation of one or more “frost-stats". They should be sited outside the building (in weatherproof covers) on the North and East side of the building where appropriate.
For a system still using solid fuel, arrangements will need to be made to fire the boiler when freezing conditions are forecast or to drain the system when it is not in use.
Where pipework is exposed to the risk of freezing it should be adequately lagged.
