I have a 20+ year old Apollo 65/80C. When the system is set on CH/Hot Water no problems. However, when on hot water only boiler makes whining noise best described as whales calling to each other.
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Thorn Apollo 65/80C Boiler Making Whining Noise
- Thread starter jl4440
- Start date
N
namsag
Stick some fernox boiler silencer in it or sentinel x200 it will soon quieten down
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