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I have a sealed central heating system with TRVs on all but one radiator. Radiators are on 10mm plumbing. When the room temp is getting close to the TRV setting, the radiators make a really high-pitched whistle, sometimes for many minutes before the TRV shuts off the radiator. It's definitely...

Is this considered acceptable, or should the flexes be under a cable clamp? It's in the airing cupboard, so the devices they're attached to don't move, and there would be no reason to touch them - except by accident. (Posting here and in the UK electrics group to see if electricians and heating...

Is this considered acceptable, or should the flexes be under a cable clamp? It's in the airing cupboard, so the devices they're attached to don't move, and there would be no reason to touch them - except by accident. (Posting here and in the heating and plumbing group to see if electricians and...

I'm expecting to have to replace my central heating boiler very soon. It's a big house with 20 odd radiators and UV hot water. There's been a lot of talk recently about smart electricity grid, electric cars and feed-in tariffs etc. I was wondering about a gas-fired micro-CHP unit to generate...

I have a Megaflo cylinder that is about 18 years old. How often should the bubble need recharging? It drips into the tundish when it's heating about every 2 months, and recharging the bubble solves this. (I always leave the valve open until the downstairs taps run completely dry.) Does this...

I don’t want to discuss the arguments for and against Weather Compensation – it’s been done on other threads. So for this thread, can I ask you to make the assumption that WC is a given – I’m planning to buy a gas boiler that includes it. Could I ask those of you with experience of installing...

My central heating is sealed radiator system with an external pressure vessel and pump, megaflo hot water, heated by a Potterton Suprima boiler. The boiler's getting old and I'm expecting to have to replace it shortly. All the advice seems to be that a sealed system should have a system...

Reading all the threads on "what's the best boiler" I've learned that the most important thing is that it's fitted correctly to a flushed system. So if we take the flushed system for granted, what makes the difference between a well fitted boiler and a badly fitted one? Clearly you connect up...

Does anyone have experience of this make of TRV? I recently fitted a bi-directional one to one of my radiators and it seems to have no effect on the radiator at all. The room gets up to 24 degrees, and the valve is set in the mid position, but the radiator is still on. It was quite a cheap...

I'm having my loft converted, and the only sensible location for the bathroom is the opposite side of the house from the soil stack. So a macerator is required. These are the issues: I want to discharge shower, basin and toilet into the macerator The ceiling height is limited - 2.1 m or...

I've been recommended this little tool for calculating radiator sizing http://www.kermi.co.uk/EN/Information/Computer_Solutions/index.phtml It looks like a fairly sharp tool - and you know what they say about sharp tools in the hands of idiots - but my question is this: If I can work out...

I have a Potterton Profile 50e which seems to have died. I'm having it replaced in 3 weeks, so I'm not going to call someone out to fix it, but it would be nice to have heating for the next 3 weeks, so can anyone suggest what goes wrong with these boilers that I could check. Symptoms are...

My boiler's just packed up and I'm having to use the immersion heater as a temporary measure. I've never used it before, so this might be a really silly question, but when I turn it on it makes quite a loud hissing noise. This stops when the tank gets up to temperature. Is this normal, or is...

I'm changing my boiler for a high power combi (37 kW). The house is about 35 years old and the gas is in an iron pipe under the floor screed. The pipe is about 6 m long and about the same diameter as 22 mm copper (I think that's 3/4"). The plumber says he'll have to test it for leaks - if...

I've been going round in circles trying to understand the Vaillant range, but I'm now considering the ecoTEC937 with the 15 l hot water store at the back. It occurs to me, however, that keeping this water hot is just like having a hot water cylinder going cold in the airing cupboard, and...

I'm having a combi boiler put in as part of a loft conversion. I was under the impression that this would involve upgrading the rising main to 22mm from the stopcock; but my plumber says you can fit it just on the 15mm rising main that's already there. Is that right? Am I going to get...