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The Vokera Linea is a combi. The internal clock only controls CH, so if you fit a programmable stat, you don’t need the clock.

Honeywell CM927. Do a search on the forum and you'll find loads of info on this unit.

(1) Heatmiser do wireless programmable room thermostats with HW control. See: http://www.heatmisershop.co.uk/products/Wireless-Programmable--Thermostat-with-HW-Output-%252d-Heatmiser-PRTHW%252dW-Kit.html and...

Having removed the internal timeclock, connect as per section 10 Fig 6 of the installation manual http://www.vokera.co.uk/wp-content/uploads/2009/04/linea_24_and_28_installation_and_servicing_instructions.pdf to terminals a and b of the CM907. Note that wiring into the boiler should be made...

There are units out there that will log pulses from a gas meter that can then be uploaded to a PC. These are pulse data loggers such as http://www.omega.co.uk/ppt/pptsc.asp?ref=OM-CP-PULSE101 and http://www.loggershop.co.uk/madgetech/pulse101a-pulse-data-logger/prod_529.html If you have a...

Yes. The Honeywell CM927 will work perfectly well. Connect as per Fig 39 of the installation manual. http://vokera.co.uk/wp-content/uploads/2009/04/unica-he-installation-and-servicing-manual.pdf

I assume you don’t have a room thermostat so, as suggested, a programmable thermostat would be the way to go. It should be a simple job to replace your existing timer with the receiver of a wireless programmable thermostat. All the necessary connections to the boiler will be there. That will...

You only need a two core cable to a CM907. It's battery powered. See http://products.ecc.emea.honeywell.com/europe/ecatdata/pdf_cm900_cmt907a1041.html

Probably the easiest method will be to mount the receiver of the wireless thermostat next to your existing programmer. You will need to connect a permanent live and neutral from the programmer to the thermostat receiver to power it. Then connect the CH ON output of the programmer to one output...

Have you tried turning down the boiler thermostat setting?

An easier possible solution you could try first is to simply replace your thermostat with a programmable version. Set this to a night set-back temperature and this will bring the heating on at a low level on colder nights. This will obviously heat the whole house but you should find that the...

An earth connection prevents a metal part from becoming live under fault conditions, by ensuring that the supply is disconnected by protection devices. The main bonding ensures that the touch voltage generated by an earth fault between an exposed conductive part (e.g. casing of boiler) and, for...

I think you are right, this is guidance. Quoting from Guidance Note 8: 'Extraneous-conductive-parts may be, and often are, connected to the MET individually, as shown in Figure 5.4. However, it is permitted to connect them collectively or in groups where the main equipotential bonding...

What the main bonding is doing is 'intercepting' an external earth potential that may be introduced into the building via a gas or water pipe. It thus has to be connected as close as practicable to the point of entry. As has been pointed out, connections along the pipework may interrupt the...

The more conductive the water pipe is, the more important it is that it is bonded. The danger presented by gas and water supplies is that they can introduce an earth potential to the building that is different to the earth potential of the electrical supply (at the MET). The main bonding...

Yes, that sounds OK. There is no requirement to separately bond other parts of the C/H, such as the boiler. It is only services that could introduce a voltage (usually earth) into the installation that require bonding to the MET.

Both gas and water must be bonded to the main earthing terminal (MET) of the installation using 10mm2 cable. These can either be run separately or via one unbroken cable linking both to the MET. See this article for more information...

Looking at the installation instructions, the boiler is intended to be wired in an S plan system which provides separate zone valves to control CH and HW. The zone valves provide separate switched demands back to the boiler (terminals SL1 and SL2) thus the boiler knows whether it is supplying...

If you have cancelled the other 5 settings then the thermostat will be set to the same temperature all the time, hence the heating stays on. If you want the heating to go off at, say 10pm, set program 6 to 12C at 10pm.

The CM67 is a programmable thermostat so it does not go on and off like a timer. You programme it to have up to 6 different temperature settings through each day. With the default settings, your heating during cold weather would be on all day because the minimum setting is 18C mon – fri and 21C...