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No, your boiler does not have the thermistor which described as that is on a later model. Yours has an earlier type with a long thin bulb which is inserted into a drypocket and does not need any heat transfer paste. But its setting should not allow the flow temperature to exceed 80 C. It is a...

Unfortunately your lighting had not made it easy for me to see which position the valves are in. Basically the handle needs to be in line with the pipe at the point it is connected.

Sounds like time to desludge. Add X400 via the header tank and bleed out a couple of litres from a rad to get some into the system. Run the system on heating only and mostly turn off the rads which are working to encourage flow into the blocked ones. X400 can be left in a system for up to...

When the valves close that normally removes the call for heat signal to the boiler. This is achieved because the valves have a micro switch which is operated when the valve opens. While the boiler is operating the temperature of the flow should not exceed 82 C and for economy it is best run a...

I do not know how you think you can hear kettling in an expansion tank. Kettling is a sound made by water inside a metal heat exchanger when it turns to steam inside on the surface of the metal. Generally those old cast iron heat exchangers are quite forgiving. Although a short pump over run...

TRVs only operate on the generality of the temperature around them. In that case, with 100mm gap at the top, the heat should be able to get out well at the top and so the temperature around the valve will be pretty much that of the lower part of the room. So I do not forsee any significant...

I was just quoting the extremely high charges for private midwives as another area where charges for some work seems far too high.

Pity you have left it so long. The steel on the rad has rusted and ideally the rad needs to be isolated with its valves and drained to below the blanking plug. Then use a brush on an electric drill to remove all the rust and then paint with some rust prevention maybe zinc based paint followed...

Thats an interesting link and I will send it to the customer who is interested. I drove past an asbestos mine in Zimbabwe and the ground was all white around it. I expect I closed all the car windows and almost stopped breathing. I also identified some asbestos pipe lagging on some 15"...

Recently I was asked what the likely cost of removal and disposal of an old asbestos cement flue might be. This is at high first floor level and about 2 m tall. I would guess about 30-35kg weight and probably too heavy to remove using a ladder. So might need a few sections of scaffolding tower...

Of course the 900 x 600 are virtually 3 feet x 2 feet and probably a "metric replacement exact size" to avoid repiping and to preserve a similar heat output.

I do not think it is in any way due to manufacturing costs. I have always thought that a size like 900 x 600 is very commonly used and therefore if they make that bit cheaper they might get all 10 rads bought from them just because one or two common sizes are better value.

You may need to loosen the gland nut on the stopcock under the handle to make it easier to turn off. Stop cocks need to be exercised every three months. The one going to the old garage may be what holds the water in so do not turn it on as you might find yourself flooding the new room.

You should measure the room temp and then run the fan heater for an hour and measure the new temperature. With -1 C outside you need to be able to raise the temperature by 22 C to give you 21 C inside. But generally fit the largest rad that you can get to fit in the space so presumably a 500...

Is that because you are not reheating the tank during showering times? A slightly shorter shower time solves many problems. Or replacement shower heads giving a lower flow rate!

100mm above and 100 mm below should be fine. I thought you had said the window was double glazed and it looked as if it was in your photo.. The big advantage of the three rad solution is that you can use a longer centre rad if you do not need rad valves on it. If the window is not double...

You should not heat the cylinder water above 65 C as that is unnecessary and risks scalding. For most people 55 C to 60 C is adequate. The safety cut out should operate at 85 C which gives a fair degree of separation. But the actual thermostat operation temperatures are not very accurate...

My advice would be to go for 500 mm high rad. You can oversize a rad with no problems but cannot undersize. I would suggest about 200 watts per square meter if you have solid walls and two external walls. Or 150 watts psm if you have only one external wall. If you are struggling for heat...

The "off" condition occurred a few days before I needed to take it for an MOT. So how to make my cat happy? The off condition shows no obvious connection with long motorway journeys.

You have said you have water coming out of the condensing vent pipe. That implies a split main heat exchanger! I am not familiar with your boiler but that would usually be a serious fault and potentially an expensive repair. Running it very long in this condition will give severe sludging up...