Bizarre as it sounds, in the kitchen next to the boiler the noise only occurs when you are running 'warm' water - so cold and third degree burns hot is fine! weird!
Hi
We have a 20+ year old boiler in the flat I bought last year. All has been well so far, but during the summer months when running hot water, the boiler began to whistle. The high pitch noise only happens with hot water, cold is OK.
I initially thought it was air, and today got the CH...