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I have used glazing tape successfully. I used 12mm x 2mm security glazing tape from Reddiseals http://www.reddiseals.com/acatalog/glazing_tapes_security_glazing.html The original sealed units were 4/6/4 glass puttied into softwood stained frames. I fitted 4/8/4 units using the 2mm tape. I...

ACL Drayton do one: http://www.uk-plumbing.com/ACL-Drayton-Invensys-Digistat-PlusC-Wireless-Cylinder-Thermostat-p-54080.html?source=googlebase and Danfoss: http://www.heatingcontrolsonline.co.uk/danfoss-randall-cet-brf-wireless-cylinder-stat-p-137.html

That's right, when the heating is running the tank temperature will also depend on the boiler thermostat setting. You need a cutout about 1/3 up from the bottom of the tank. You can get wireless tank stats if wiring is a problem, but wired is preferable.

If you don’t want to go to the trouble of re-plumbing you can insert a boiler interlock by adding a tank thermostat and wiring as shown below. Once the tank is up to temperature, the boiler will only fire when the room thermostat demands heat. However, you will need to keep the timer so that the...

If you want thermostat control in two places you can connect two thermostats in parallel so either can turn the heating on but they can’t turn each other off. So if it’s turned on upstairs, you’ll have to turn it off upstairs. If you are looking at using wireless controls, you could, for...

The OP asks if he can replace a time-switch with a programmable thermostat. I thus assume he doesn’t currently have a thermostat.

Presumably the timeswitch is not located where you would want a thermostat to be, so a wireless unit would solve this. The receiver of the programmable thermostat should fit (electrically) to the connections that are provided to your timeswitch, assuming it is external to the boiler. If...

The spec for your boiler quotes a maximum gas rate of 2.72 m3/h. So 20 m3 a day would mean the boiler is running at maximum output for over 7 hours a day. This should not be the case if you only have the heating on for 8 hours a day. To check your electricity usage, you could get an...

Connect Live to A, Call to B. You don't use the neutral connection. No wiring changes needed to the timer.

120W = 0.5A, not 2A.

I think it says this because the frost thermostat would only work when the internal timer is on, so would not protect the system all the time. An external thermostat should work OK with the internal timer. It depends if you want the advantages of having programmable temperatures through the day...

It seems that differential thermostats are commonly used in solar applications to detect when the solar collector is warmer than the thermal store, which is really exactly what you are doing. Such as http://www.novusautomation.co.uk/acatalog/copy_of_N231-S.html . I suppose the only consideration...

Yes, any wired thermostat will do the job, but I think it is worth paying the extra for a state-of-the-art device such as the Honeywell CM907 (programmable) or DT90 (non programmable). The thermostat is switching mains voltage so you need mains rated cable, such as twin and earth or three core...

It will work at any temperature either side of the set temperatures. So if downstairs is set to 18C and upstairs to 22C, so long as the downstairs temperature is below 18 and the upstairs above 22C, the system will switch on your heat transfer system. If you want the system to work whenever the...

No, it would not work at 20C difference between the two. But if both thermostats are set to the same temperature it would transfer heat if the attic is warmer than the bottom floor, but only if the attic temperature is above the set temp and the bottom floor is below. So in your example, if you...

If you connect an upstairs and downstairs thermostat in series you should achieve what you want. Assume Live is connected to the ‘common’ of the downstairs thermostat, connect the ‘call for heat’ output of the downstairs thermostat to the common of the upstairs thermostat and the ‘call for...

It is certainly worth having a thermostat, not only for the enhanced control and comfort it provides. As you suspect, this will prevent the CH pump and burner from running when there is no demand for heat (boiler interlock). For reasons of efficiency, Part L1 of the building regulations now...

When the house is heating up and the room temperature is below the thermostat’s proportional band, the thermostat heat demand (flame symbol) should be on constantly. The proportional band is a range of temperature (default 1.5C) around the set temperature within which the thermostat reduces the...

Fig 13 on page 12 of the Installation manual, http://www.worcester-bosch.co.uk/cache/file/193/installation-and-servicing-instructions-for-24cdi-rsf--discontinued-07.pdf shows how to connect an external programmer and/ or thermostat. Unless you have existing wiring, you will have to run a two...

I can't see any such connections on the wiring diagram for your boiler. The external thermostat connections are to terminal block ST8. To where is your existing programmer connected?