My place leaks like a basket even though I recently did the windows. Letter box, the ceiling latch to access the loft and so many bits and bots leak air in constantly. My heating system is also quite old. I believe the boiler is about 30 years old now, but I don't want to replace it since it's still working great.
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A new boiler may be more efficient and pay for itself. I made a box that goes over the top of the loft hatch and it keeps some extra heat in. It all adds up.
It might. I was offered something similar but I'm afraid of it breaking regularly. Most modern devices aren't as well built as the old ones.