Hi,
We had a new boiler installed into our house 14 years ago. As far as I know we have never changed it and may have serviced it once or twice. Recently, after noticing that all my radiators seemed half filled, I have tried bleeding all the radiators but some fill up and some don't. Should I consider draining out the system and putting new liquid in?
I'm worried this could affect my gas bill as its not warming my house efficiently enough.
Thank you!