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To answer your original question, the motorised valve can be fitted to either the flow or return (between the tee and the tank of course), but it is better in the return because it's cooler - simple as that. In most installations nowadays, there will probably be some re-plumbing needed to make...

Thanks for the replies. Unfortunately this fault is intermittent, so I am reluctant to call anyone in - for example, when I checked last night, it was working perfectly. The pilot ignited several times with the first spark, and the pilot light itself was, as far as I could see, exactly as shown...

There appears to be an intermittent problem with my 2 year old Potterton Profile 80eL boiler, in that the pilot light has failed to light twice recently, and sometimes seems to take a long time to light. Normally, it lights after one or two sparks, but recently, can take up to a minute of...

Check the compressions - my bet is that cylinder 3 (left front, where front refers to the front of the car) is considerably lower than the rest. What is the mileage?

Probably the mass air meter. They cost around £70 and take around 15 minutes to fit.

Yes, so long as the wiring between each FCU and the 32A is rated to carry at least 32A - 6mm2 should be sufficient.

Thanks very much for your replies - much appreciated.

I have just subscribed to broadband, and am just about to run the wires from a telephone socket to the computer, and have the following question: The instructions state that each piece of telephonic equipment should have a filter installed to prevent interference with the broadband...

No. Sudden loss of power that resets itself after switching off is often related to overboost - at what engine speed was the power suddenly lost? I would guess that it was over 3000rpm, and if you stay below this, the problem won't occur. If this is the case, it could be sticking turbo vanes...

1 unit = 1kWhr, not 1kW 1 kWhr is equal to using a 1kW appliance for 1 hour. Therefore, using a 2.5kW appliance for 1 hour will use 2.5 units of electricity.

If you go down the 'length of plastic pipe' route, 2 metres should be plenty. The problem with the bonding clamps is that they are made out of a different metal from the pipes, and in an area prone to condensation (like a bathroom), you will get bimetallic corrosion and deterioration. This is...

If the pipework leading to the towel rail was plastic, there would be no need to bond it. I guess that if you cut a length out of the copper pipes under the floor and put in sections of plastic pipe, that would solve your problem. All of the upstairs plumbing at my house is plastic, with only...

ooo....errr

Be careful with putting a TRV on the bathroom radiator. Some boilers require a bypass circuit to allow the pump to run on for a few minutes after the boiler cuts out - this is to prevent boiling within the boiler and allow the heat exchanger to cool down progressively. Quite often, it is the...

Yes, a good quality hole saw should do the job neatly - it is a good idea to keep it well lubricated with oil, and allow it to cool occasionally. In terms of it's acceptability, if the hole size is no more than around 30mm maximum (assuming the RSJ is around 250+mm deep), and drilled on the...

Use 2.5mm wire for the spur to a 3A FCU (if you use a switched FCU, this could double up as the light switch), and then 1.0mm wire from the FCU to the light. However, it is important to ensure that the double socket is not already a spur - you should not spur off a spur.

Like most things in life, if you choose good quality components and install them properly, you will have no problems. Plastic pipe + good quality fittings (eg. Tectite, Cuprofit) + doing the job properly = a good reliable installation. One of the pitfalls is the thermal expansion (although on...

I didn't say (or mean) that there was anything improper about a properly made crimp joint, but was merely pointing out that there is also nothing wrong with a properly made screwed joint either. The coefficient of thermal expansion copper and brass is virtually identical, and in a house the...

I think I've probably said this before, but I used an angle grinder to chase out channels in the wall..........once.

Because it's already there. However, the cupboard is small and on the shelf concerned, we could only fit a small saucepan anyway. Thanks very much for the reply.