In my continual quest for efficiency and less gas consumption I have just taken delivery of a Weather Compensation Kit for my boiler, which I will fit this coming weekend.
Not a requirement in the UK, yet mandatory in several continental countries, a Weather Compensation kit monitors the outside air temperature and varies your boiler's flow temperature. eg. as the outside temperature drops, the boiler temperature increases.
The reasoning behind this is as follows. Heat loss from a building is proportional to the difference in temperature between inside and outside. Therefore, in order to maintain a comfortable room temperature on very cold days you need to put more heat through your radiators. Turning your room thermostat up doesn't do that (though that's what most of us do!). To get more heat into the room you have to turn the boiler thermostat up. Conversely, when the weather warms up you should turn the boiler thermostat down so you don't waste gas and money.
There would seem to be two benefits to fitting a Weather Compensation Kit. One is that your house should keep warm even on the coldest of days. The second is the boiler will turn itself down on warmer days, ensuring the boiler is always working in its most efficient condensing mode, thereby saving you money.
Most modern, condensing boilers can be fitted with Weather Compensation Kits. Mine cost £21, delivered, from Amazon.
I will follow this thread up after a month and let you know if I see any difference in comfort levels and/or gas consumption.
Meanwhile, anyone got a Weather Compensation Kit fitted to their boiler and if so, do you have any pointers that might help me set it up?