Firstly, you need to know that in the UK, not every body qualifies for a free boiler grant (you can find more detailed information on this website) and you will need to meet certain criteria.
Basically, the grants are aimed at families in the UK’s lower income bracket and who are currently claiming one or more related state benefits.
If you qualify , you can get up to 100% of the cost of replacing your old boiler from the grant.
One other thing you should bear in mind is that there is only a certain amount of money in the fund for each financial year. Once the fund is allocated to claimants, no more grant will be issued in that period. This means that if you are not one of the first to make an application at the beginning of the financial year, you could miss out due to all the funds being allocated quickly.
Even though the grant is for replacement boilers, you need to understand that it may not cover some part of the work or system that you are replacing – it is important, especially if you are on a restricted budget, that you know which elements fall under the grant & which do not. Other wise you could end up having to make a personal financial contribution to make up the difference between the amount of the grant and the cost of the work.