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That's the by-pass pipe, running from after the pump and before the 3 port valve. We've already agreed that the by-pass valve should be left shut since there are no TRVs.

A cubic metre of gas has a calorific value of around 38 MJ. There are 35.3 cubic feet in a cubic metre, so calorific value of cubic foot is 1.08 MJ. To get a value in kWh we divide the MJ by 3.6 to get about 10.5 kWh /m³ or 0.3 kWh / ft³.

Interesting question. The gas used by your boiler will vary with the outdoor temperature. For example if the heating system is maintaining an internal temperature of 21°C, at external temp of 10ºC you will consume half the gas that you would at -1°. Heat losses from the house will also vary...

Expansion vessel. It's covered in the FAQs.

It's not really your problem. It's your neighbour's problem. Just tell him politely that you would prefer not to have any pipework projecting over your land, given how narrow the "alley" already is, and that there must be other ways that he can resolve his problem.

And no TRVs (no apostrophe!) on the rads? I think it's 1970s or thereabouts. That means the cylinder could have a minimally sized coil in it. But you need to check that coil return connection for a blockage. It's quite easy really. You close off the three gate valves (one above pump, one on...

Thanks mod 5! :D :D :D It's taken a while but we got there in the end. Now I have to think of something else to go on my posts. Last Triumph, I edited my previous post while you lot went onto page 3. You might want to check back on that. I suspect a blockage on the outlet from the coil...

What a mess! There are a few faults there, particularly the lack of a proper flange connection for the hot supply to the shower. But first can you check the gate valve on the pipe from the lower coil connection. This may be very nearly shut, thus restricting flow through the coil. Check how...

How about these?

Isar is a combi boiler! :wink:

You should have mentioned this before! This is clearly the root of the problem. Something is blocking the flow through the cylinder coil.

Why do you have to put the heating on to get hot water? Why don't you just have the hot water on?

You probably need to upgrade your hot water cylinder. Modern cylinders have a much bigger heat exchanger coil in them and so reheat more rapidly. You could also consider increasing the capacity of the cylinder. Also you need to look at the circulation from the boiler to cylinder - is this...

The underside of the cylinder should be ventilated to prevent condensation and presumably possible corrosion. Ordinary floorboards with gaps would be sufficient. Otherwise some strips of wood should be placed underneath to raise the cistern slightly off the floor. Chipboard floors would be...

Look at pressure issues and expansion vessels in the FAQs. Does the pressure rise occur constantly or just when the system is heating up?

Firstly the diverter valve would only be open to one or the other heating circuit, not both together. Is that what you want? Secondly the diverter valve may be a design which closes off a branch by pushing a rubber ball against the opening. If the flow was in the opposite direction it may be...

No sign of an active leak there. What about the Schrader valve on the expansion vessel? If air was leaking from that it would appear as a drop of the system pressure. Also are you sure that the flow and return iso valves are fully shut? If so, you must be losing water somewhere from the boiler...

About £7 for a motor and £35 for a mid-position valve - not Honeywell of course. Sounds like the wiring's all wrong, or something. You shouldn't be getting faults with anything like that frequency, even if the valve isn't a genuine Honeywell.

Check the AAV. They often leak. Have you looked around inside the boiler? The leak could be inside the combustion chamber.

The state of the burner is irrelevant. The spark is generated at the PCB, carried along the lead and delivered by the probe. The circuit is completed by the earth connections. If you're not even getting a spark off the end of the lead then you have either a faulty PCB or lead or connection...