Yes, if it is a modern condensing boiler and it has sufficient power to keep your house warm at that setting. Large radiators do not need to run as hot as small ones for the same output.
The amount of heat you use depends on various things, especially the quality of your insulation and draughtproofing, the size of your home, and the difference between internal temperature and external temperature.
You are not charged per cubic metre. You are charged per kWh. There are roughly 11.2kWh in a cubic metre. Around 2.5p per kWh for gas, plus standing charge plus VAT is not unusual but it depends where you are and what tariff you have chosen. You can search on https://clubs.moneysavingexpert.com...936.229831981.1606897998-623098997.1557300041
If you need to find a tradesperson to get your job done, please try our local search below,
or if you are doing it yourself you can find suppliers local to you.
Select the supplier or trade you require, enter your location to begin your search.
Please select a service and enter a location to continue...
Are you a trade or supplier? You can create your listing free at DIYnot Local