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The thermostats need to be in the room that you are heating -so it can measure the temperature of the room; not in the boiler house. This will require running a 2-core cable from the boiler house to the appropriate location. If this is not possible, you would have to install wireless thermostats.

Just checked: it's 433MHz. :D(y)

Thanks for this information. I have checked Draytons web-site and the thermostat/transmitter is available on its own. I checked the specs of the various options and the Digistat +2RD and +3RF both have "On/Off load compensation" with two settable parameters: system type (gas or oil), and Syste...

What won't? Are you saying that no one makes a receiver which will fit my WB boiler?

Is the boiler runing continuously? Or is it cutting out every few minutes, waiting, and then restarting? Which boiler do you have?

So the pump is not providing sufficient pressure to enable the water to reach the furthest radiator. What was the make and model of the old boiler? Same info for the new boiler.

The pump may be making a noise, but how do you know it is actually moving the water? The impeller may be broken. Is the pipe on one side of the pump hot, but the pipe on the other side cold. If so the pump is not working.

I understand that; I was hoping someone would know of an RF stat with a receiver which would plug into the boiler in place of the existing reciver.

Moved in to my house in June. It has a WB 37CDi combi boiler, which is about 10 years old. This is controlled by a WB DT10/20 RF thermostat (not sure exactly which version), which has the receiver/HW time control installed in the boiler. I would like to change the thermostat to something more...

TRVs control the room temperature by controlling the heat emitted from the radiator. They do this by altering the flow through the radiator: faster flow means a higher return temperature. consequently a greater output, slower flow results in a lower return temperature, so a lower output A TRV...

Which boiler do you have (make and exact model)?

Remove each TRV head and check that the exposed pin in the valve body will go down when pressed and pop up when released. If the pin is stuck 'up' you may be able to free it with some silicon oil. WD40 is not recommended as it will rot the seals. If the pin is stuck down (rad always cold)...

I've added an extra instruction.

It doesn't make any difference which side of the rad a TRV is fitted. All it i doing is adjusting the flow through the rad to maintian the required room temperature. If the room is cold when the heating is turned on, the TRV will be fully open until the room temperature is about 2C below the...

Here's how to do it: 1. Remove all TRV heads and open any wheel valves 2. Set all lockshield valves to 1/3rd turn open 3. Turn heating on and wait for everything to warm up. 4. The flow pipe temperature of all rads should be about the same so you need to concentrate on the return temperatures...

If you turned both valve off on all radiators, the system will no longer be balanced - if it was already balanced - so you wil have to rebalance the system. This ensures that each rad gets its fair share of the heat being circulated.

This could be the TPI (Danfoss call it 'Chrono-proportional') control algorithm working. If you have the Installation Manual, it's options 34 and 35 in the Installer Advanced Programming mode. The purpose of the algorithm is to prevent overshoot (temperature continuing to rise after target has...

Your second suggestion is correct: it's radiating 1.5kw against a 1kW rating;it's not "free" energy. The extra 0.5kW comes from the water, so the boiler has to produce an extra 500W -if that is possible. Thats why rads have to be tested under specified conditions: it ensures a level playing...

Unfortunately, you are incorrect. The current standard (since 1997) specifies:flow of 75C, return of 65C, room temperature 20C. The rad is connected TBSE (same end). There is no specified outside temperature as it is irrelevant; the test is measuring the output when the air temperature is 20C...

Radiator output is measured in a controlled environment as laid down in BS EN442. What gave you the idea that it is calculated?