In fairness to all, we don't discuss pricing on the Wall. Thanks for your cooperation.
Radiator making banging noise
A few minutes after the thermostat turns the boiler on, and the radiators begin to heat up, some of the radiators in my house (not all of them) will occasionally make a really loud bang, as if you hit them with a hammer, and sometimes you can feel the resonance going through the floor. This is really annoying because sometimes I wake up at a very early hour and then can't fall back asleep. What could be causing this?