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Bolleaux. I've seen chilled beam installations with ventilation systems and perimeter heating under the windows. The computer-aided thermodynamic modelling consultants advised it and I wasn't going to argue.

I'd stick the rads under the windows. It might be cautious, but I'd be confident that I wouldn't get called back to sort out a cold draught and have to re-locate all the rads at my expense. I'd let someone else do the innovative stuff and copy them if it turned out alright. There's no...

Why, thank you, kind Sir. I shall now get wasted on White Russians to celebrate my elevation to dudedom.

Meaning I've never had to try it and don't know. I won't pontificate about something I don't know about. You wish! Where did you get that from? http://www.pilkington.com/~/media/Pilkington/Site%20Content/UK/Reference/TableofDefaultUValues.ashx The external surfaces are always going...

I missed this. The official, kosher, 24 carat reason for putting the rads under the windows is convection and draughts. The windows usually have the highest U value and are the coldest surface in a room. They cool the air and you will get a current of cold air cascading down the...

It has been worked out. The most efficient heating method is to; 1) heat the building (and/or zones) only during the occupied periods and 2) provide the heat with a modulating condensing boiler with a variable flow temperature, so that the standing losses are minimized by keeping the...

Insulate, insulate. Room temperature sensor (thermostats are so neolithic) in a programmable controller. Insulate some more. Outside temperature sensor and weather compensation controller, if one is available for your boiler. Probably an entire control package is available, so you won't need...

http://www.powermax-repairs.co.uk/contact.html This man's a specialist, but I don't know whether you're out of his range. He may know of someone closer to you, or you may find someone mentioned in the archives on his discussion forum.

It is more useful than you can imagine. Once you've seen one installation, you'll understand its applications. A typical domestic installation will be collecting numerous bits of data (flow temperature, return temp, outside air, system pressure, boiler firing rate, cylinder, faults, etc)...

The major advantage of the vented system is that it is simple and almost foolproof. Discharging the OV outside makes it vulnerable to contamination and freezing. Freezing the OV could cause an explosive rupture of the cylinder. The failure mode (thermostat welded itself closed ) has been...

Honeywell V4043 zone valve, get the 24 V ac motor, 40001011-002. A plumbers' merchant would order it. Most commercial valves are 24 V ac, but stick with Honeywell for a domestic job. http://www.honeywelluk.com/Documents/Reference-Guide/pdf/911.pdf

Any open pipes or ducts are liable to contamination if terminated outside. http://i.imgur.com/caEpBHW.jpg I'll stick with the indoor version.

They'd be liable to contamination, freezing, blockage or theft outside. A poster on another forum reported that they were commonly terminated outside in Scotland. Inside they terminate inside a clean, sealed tank. It is very unusual for the water to actually boil, even rarer now since new...

The manual says it can only cope with one.

It's just a relay, any competent heating technician or electrician would be able to pick a suitable one from a catalogue. There are dozens of different coil voltages and contact ratings in electrical catalogues (TLC, Maplin, RadioSpares, etc.) . I'd use a DIN rail mounted one and put it in...

Oh, yes they are! They're a modulating control device that can vary from 0 to 100% open. In either extreme they will be fully open or fully closed, but they usually modulate to regulate the flow to maintain the required temperature...

Utter nonsense, as controllable as gas or oil, and a sound finsncisl choice for some installations, especially given the RHIs. I don't anticipate gas or oil will become cheaper in the forseeable future; political instability in the Middle East or Eastern Europe could make either unobtainable.

It was you, wasn't it, Tony?

NOOOOOOOOOOooooooooooooooooooooooooooo! It's a 5 year old thread.

This thread went quiet very suddenly. Was it something I said? :D