I've found this, there's some numbers to ring to find out if you qualify.
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Energy providers' freebies used to focus on free loft and cavity wall insulation. Now four out of the big six are giving away boilers to those in certain groups as well.
WHAT CAN YOU GET?
A new boiler typically costs £2,300, according to the Energy Saving Trust, so this is a fabulous freebie. If your boiler is not an inefficient model, just broken, you may be offered a repair, rather than a new boiler.
The offer includes fitting, though there may be an extra cost if it needs to carry out extra work, for example, if the work means additional radiators or if the boiler needs moving to another location. You should be told about this beforehand.
WHO CAN GET THIS?
You are likely to qualify if:
You get tax credits and have a household income of less than £15,860 OR
You receive income-based benefits, such as pension credit or income support, and you’ve either, children, a disabled person in the household or are over 60.
You won't be able to get a free boiler if you live in a housing association property or are a council tenant. The idea is they will arrange to do this for you though their own schemes.
The criteria are complex, so a quick way to check if you qualify is to call the Energy Saving Advice Service and answer a few basic questions on 0300 123 1234 (England), 0800 512 012 (Wales) or 0808 808 22 82 (Scotland). Also see providers' criteria in How to get it.
WHAT KIND OF BOILER DO YOU NEED TO HAVE?
In a nutshell, to be eligible, you need to have a broken or inefficient boiler. If you've a new-ish, working A or B rated boiler, it probably won't qualify.
This is decided on a case-by-case basis through a free inspection. The providers say it's based on a number of factors, including the boiler's efficiency, age and condition. SSE says: "If the boiler was installed more than seven years ago, it's likely to be inefficient."
The energy companies will usually just replace gas boilers, not oil. Sadly, if you don't have a boiler already, you can't get a new system installed.