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The requirements for heating system controls are contained in the Domestic Building Services Compliance Guide, available here: http://www.planningportal.gov.uk/uploads/br/domestic_building_compliance_guide_2010.pdf

Yes it does - in fact it will only be needed to control the HW. However, you should get a much improved control of your heating.

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You should provide an earth at the programmer. You may not require it for your programmer but it may be required in the future. Any suitable cable you use to connect the programmer (e.g heat resistant multicore or twin & earth) will include an earth core which should only be used as an earth...

It sounds like you have a gravity fed DHW system and pumped CH. So yes the pump will be switched from the NO output of the receiver.

You are right that you will still need the timer to control the DHW. Yes you can bridge the live and neutral from the timer to the new receiver. The contacts of the thermostat receiver need to be connected in series with the CH output of the timer. So connect the CH On output of the timer to the...

No. RCDs do not provide short circuit or overload protection, only earth fault protection. Your heating system and boiler should be protected by a 3A fuse normally supplied via a switched fuse unit.

Actually, I realise that the problem I probably have is that there is a check valve fitted in the pipe which won't allow water to drain through it. So having a drain valve low down still won't allow the pipe to drain. I suppose I would have to fit the check valve above the stop cock? Is it...

I have a section of 15mm pipe in my garage that connects to an outside tap. This pipe freezes during long periods of cold weather. I fitted a stop cock which allows me to isolate the pipework to prevent floods but the pipe still freezes and pushes open one or more compression fittings. How can I...

Looking at Fig 29 in the 105e Installation and Servicing Instructions:- http://www.partsarena.com/baxi/System/DATA/Dx/DS1/installation/2288/I05-2288/I05-2288.htm You are correct that the timer and thermostat are wired in series as per the diagram. As you say, input L on the thermostat is...

The DT90 is a good choice. It is a modern TPI controller rather than just a simple thermostat and it is simple to install - data sheet available here: http://products.ecc.emea.honeywell.com/europe/ecatdata/pdf_dt90_dt90e1012.html. The CM907 gives you the advantages of programmable...

I'll rephrase that because you have added info and other questions.

Have you not connected the Heatmiser thermostat feed to the ‘HW On’ from the programmer (terminal 3), hence you have to have HW on for the CH to work? It sounds like the limitation you may have is that the programmer can only be HW or HW + CH, as per a gravity fed system. You need a separate...

I think it may depend on the boiler type you have. Post the make/ model and someone should be able to tell you. There you go - no need.

It sounds like there is no room thermostat fitted. Fitting a room thermostat in the hall may be a better idea.

Example of pipe thermostat here: http://www.uk-plumbing.com/honeywell-l641b-low-limit-pipe-thermostat-p-1486.html The wiring diagram titled ‘Low limit (frost protection)’ in the data sheet available from the web page shows how to connect the pipe stat.

How does the UFH system call for heat from the boiler? Is the UFH heating circuit connected from the boiler via its own motorised valve? I note that a ‘key feature’ of the Continental CP2 system is that it ‘links to your existing radiator circuit’. This would suggest that it relies on hot water...

It depends rather where you are wanting to run the wiring. However, 1.0mm twin and earth cable like this: http://www.tlc-direct.co.uk/Products/CA1G.html will generally do the job.

When the heating has been brought on by the frost stat, is it actually controlled by the room thermostat? If not then obviously changing the room thermostat will have no effect on the frost mode operation. The frost protection should be independent of the room thermostat because it may still...