Boiler whisltling and Microbore pipework

[blasted]

Bit of a two parter here so any advice that can be offered is greatly received.

Firstly, my Main Eco 30 Combi boiler has recently started making a whistling noise when there is a hot water demand, sometimes a noise can heard through the shower, additionally the hot water seems to be running a couple of degrees cooler than before, occasionally it blips back to where it should be. I recently changed a seal on the one of the water temperature sensors as the old fibre one had dropped to pieces, but I don’t see how this would have affected it though. Is it likely to be air in or around the combustion/hot water area? If so is it possible to bleed it?

Secondly, my central heating pipe work is 8mm microbore and is getting a bit tired, I would like to add another radiator and upgrade another, the plaster over one of the pipes in the wall has cracked and generally they are looking tired. Is it a difficult task to change to 15mm pipe work aside from getting access to the manifold in the floor upstairs, are there any benefits? I like the fact it’s a little more robust.

Thanks

 

[Agile]

Sometimes the flow restrictor rubber gets stretched and will whistle. But it might be something else.

Its probably going to be easier to repipe in 10mm which will be a lot better than 8mm.

To repipe in 22/15mm is a lot of work but gives a good system. It does need to be properly designed though.

Tony

 

[blasted]

Thanks,

The system currently has 22mm coming to and from the boiler so I assume it would be a case of a 15mm circuit coming from that, plus like you say, thought has to be given to the design.

I will have a look into your suggestion about flow restriction. Its only really happend in the past couple of weeks. It almost sounds like a kettle starting to whistle when it boils and its coming from the bottom of the boiler.

 

[Agile]

Sometimes the flow restrictor rubber gets stretched and will whistle. But it might be something else.

Tony

Thats part of the boiler!

The key is in the word restrictor ( and not restriction! )