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All boilers have adjustable thermostats, don't they (well except for a 'special' made up by Potterton at a Council's request, so the tenants couldn't fiddle, that I saw 25 years ago)? You just haven't found it. try taking the front cover off. I'm sure if you rang up the makers, they'd be able to...

Just a suggestion/question really. Does anyone think it would help to attempt a bit of isolation? By replacing the copper pipes to the boiler with plastic (taking heed of the boiler makers stipulations, usually no plastic pipe within one metre of the boiler)? Ensuring the flue is not solidly...

I'm confused by the sketch, it can't really be like that. if the valve C connects to the heating coil on the cylinder (two 22mm pipes on the side of the cylinder, one above the other, at about one third and two thirds of the clinder height), then it could be to restrict the flow through the coil...

In my opinion, an external mechanical timer is an external control......... After all, it's external and controls the boiler!!!!!!!!!! So is a wall stat Don't know your specific application , but some boilers require both a permanent live supply and a timed supply. The permanent supply is...

18 rads implies a not enormous house so a standard sized pump might be fine. If you want to know for sure you need to give a lot more detail, like heating output, number of floors, pipe sizes etc. You could make enquiries of a pump manufacturer such as Grundfoss. Has the system ever worked...

Perhaps the boiler is overheating and boiling the water. If you bought a pipe thermometer fro a plumbers merchant you could check this, or you could turn down the knob on the boiler to see if it fixes it.

Fernox sell a kit to do this fairly easily at a radiator vent. You can find it at places like Homebase

This can happen when the water level in the cistern is too high. It should only fill to the line (which may be somewhat indistinct) marked on the back of the cistern - visible when you take the lid off, usually about 2" long in the middle of the cistern. The level rises as the washer wears out...

I like the Flamco Flexvent AAV, because you can unscrew it from it's base for cleaning. It has a special sealing arrangement so that you don't have to drain down and you don't get a leak. Clever.

If you open the valve a little (it's fully open when the slot is along the length of the valve and fully shut when it's across the length - like a gas valve often is) the noise may go away, but you may find some rads not heating. The valve you have is not really the right thing to use as a...

Most popular place for a leak is one of the valves on the rads. Sometimes it's not obvious because the hot pipes dry off the evidence, although there's often a stain. Checking when it's cold might show it, but sometimes the only leak when hot. Other than that, it's up with the floorboards, I...

How do you stand with wiring up the controls and boiler? Surely that is work that is not exempt from the dreaded Part P, if you're making any alteration. So that's another problem.

I've just seen Softus' reply and think I know what he will say next!!

I bought a Wilo Gold pump in Wickes last year for about £40, I think. I took about an hour to change it for the old one, but I was lucky because the old one came out fairly easily and there was good access.

What I meant was:- When the system is on, the pump is running. If the thermostatic valves close down (because every room is up to temperature), then as they close down they can start to make a wooshing sound as the pressure builds up. it's a bit like putting your thumb over the end of the...

you can get fridge/freezers with separate controls for each compartment. If you look at the back you will see two compressors, one for the fridge and one for the freezer. If you read the manufacturer's literature, it will specify the minimum room temperature and this is usually a typical heated...

I think you must be mistaken. Thermostatic valves both sides of the rad doesn't make sense or seem likely. Do you have any better information e.g. makers name and model number? If not can you measure them and say how big they are? More likely that they're not thermostatic, in which case...

I'm struggling with your terminology a bit! Normally, each house has it's own 4" drain, which goes to the property boundary (with manholes at every junction and every change of direction, laterally or because the fall of the drain varies). At the boundary there is a trap, called the...

Does your system need a bypass circuit and has it got one? Is the pump set too fast?

Briefly, buy 2 pipe thermometers (plumbers merchant). Check they agree by putting them on the same length of pipe near the boiler. Put system on. Set boiler to max (82). Open all lockshields and set TRVs to max. Fix the thermometers to flow and return of each rad in turn,starting with the one...