I bought one of these from a Scottish company for around €30.00 odd , and it broke within a few weeks. I made my own "ballon "using two heavy-duty plastic bags filled with attic insulation. It works a treat.
I was on a service visit to a house where something similar was used to block the chimney, it had been fitted by the previous owners, the new ones were there 3 weeks
and all were suffering carbon monoxide poisoning from using the gas fire!
They were very very very lucky that their boiler broke down and I checked the chimney as part of a routine visit.
Blocking a chimney is a very dangerous practice, I understand the heat loss implications
Our solution is in place for 6 years now - stuff a pillow up the chimney - great! Mind you, don't expect to use the pillow again
How much heat can be lost through the chimney anyway?
I've always thought you needed to allow a bit of ventilation into the chimney.
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