About a year ago, I had the bathroom towel radiator replaced with a larger one, and an electric dual-fuel element added.
The wet circuit is driven by a Multi-fuel stove that is rarely used, and the electric element is used almost all winter, on a programmable thermostat, to heat the bathroom.
It works fine, except that over the last two months, when the element is powered and heating, it makes noise, which can vary from a slight fizzing, to louder pops or bangs that resonate through the pipework and is loud enough to be a nuisance. They come from where the element is, within the radiator.
I had all the radiators fitted with Aladdin auto-bleed valves at the same time, a year ago, but if I turn on the circulatory pump, I can hear some air in the system downstairs - I don't know if this is relevant. But bleeding the pump does not clear that, and running the pump or the stove for a few hours does not solve the radiator noise problem, and it is getting quite annoying.
It's NOT the usual noise of expansion and contraction of the radiator. I've checked that the mountings are not overtightened, and I can tell that the noise is being created by the water within the radiator around the element.
What could be causing the problem, and how can I fix it?
What can I do to
The wet circuit is driven by a Multi-fuel stove that is rarely used, and the electric element is used almost all winter, on a programmable thermostat, to heat the bathroom.
It works fine, except that over the last two months, when the element is powered and heating, it makes noise, which can vary from a slight fizzing, to louder pops or bangs that resonate through the pipework and is loud enough to be a nuisance. They come from where the element is, within the radiator.
I had all the radiators fitted with Aladdin auto-bleed valves at the same time, a year ago, but if I turn on the circulatory pump, I can hear some air in the system downstairs - I don't know if this is relevant. But bleeding the pump does not clear that, and running the pump or the stove for a few hours does not solve the radiator noise problem, and it is getting quite annoying.
It's NOT the usual noise of expansion and contraction of the radiator. I've checked that the mountings are not overtightened, and I can tell that the noise is being created by the water within the radiator around the element.
What could be causing the problem, and how can I fix it?
What can I do to
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