Selgas
Ya thought about installing heat tracer wires along the route of your exposed cold water pipes and those hot water pipes a ways from the hot water tank???
This system will apply a small amount of heat to the surface of the pipework and prevent or minimise the risk of freezing water pipes at locations where they could burst and do the most damage.
The tracer wire is usually connected through a thermostat so that it will only activate when the temperature drops below a preset temperature and then likewise turns itself off when the pipework goes above the maximum set temperature. 
Selgas Services Ltd
Craftsman Gasfitters, Plumbers, Electrical Service Technicians
