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These are very simple non condensing boilers and so quite reliable. But with a cast iron heat exchanger they are not very efficient. The only common faults are for the fan to wear out or just need lubricating. And for the PCB to fail as they put it beside the combustion chamber which gets...

Yes, I would agree about £4000 to £5000. But the first step is to determine what size each rad needs to be and then what make of rad you like. Then get quotes based on those rads and the make that you have chosen. So the quotes are based on those exact rad sizes otherwise some installers...

It may be part of the design but the flames look surprisingly yellow to me.

A boiler in the loft would not give any gravity flow downwards. So you must have a pumped system. It may need balancing but one thing is certain that you have plenty of power available.

The Water Regulations stipulate the 750mm depth. Where it comes up to the surface it needs to be insulated.

Buried water mains are meant to be at least 750mm deep so that they will not normally freeze. Your proposals make it sound to me as likely to get frozen pipes whenever we have a cold spell. With all those water items in your office you will need background heating there.

Without seeing it then it is difficult for me to come to a conclusion. However yellow plastic is quite flexible and I would have thought it might be possible for you to dig a trench under it and just push it down into your trench. Probably bedded into about 100 mm of soft sand.

Well I am glad that we correctly advised that it seemed to be the PCB But that PCB is all analogue with no CPU or memory or look up tables. Unlike current PCBS which operate as small computers and often get computer like silly faults and can be very sensitive to switch on sequences. And...

But he could look at the opto isolator if it uses one to isolate the switched live from the boiler circuitry. But he may find a lot of the circuitry rather before his time.

Anywhere there is one fitted you might as well power it. The consumption is minute. Research on them is minimal. But this is mainly because there is no vested interest in financing it. But I was involved with the launderette industry where there is considerable interest. I am convinced that...

I am not a fan of car cleaning. But can anyone suggest what I might best use to clean the front alloys which have gone a nasty reddish colour?

But the gas pipe could presumably be lowered so that it is adequately below your new path. The required depth will depend on what the gas pipe is made of. Usually plastic or steel. And to a degree how your new path is to be finished.

I am discussing replacing the external door where the wired glass has been cracked ( by what looks like a 10-12 y.o. boy who ran across the road with a stone or something in his hand, broke the glass and immediately ran back ) Can anyone suggest a model of door which would suit replacement of a...

It is a traditional wooden door with a top and bottom panel.

From memory, plastic gas pipe should not be used inside a property because it would melt and let the gas out if there was a fire!

Well you really should get the pump connected back to the boiler. And the boiler needs to be connected to a permanent live. Your system have no pump over run at all and that will cause thermal shock to the heat exchanger immediately the boiler turns off. And it will prevent the frost...

No one replied so for reference searches I am adding a reply. The setting for pump over run time is in setting d1 in minutes. From 1 min to 60 min The factory default is 5 minutes. I would expect, but am not sure, that the actual time could be more than the set value if the temperature is...

The link should have been removed on installation when a remote switched live connection was provided. 3 is just a mains connection to enable a room stat to be connected between 3 and 4 if very simple controls are being used. Or just linked if no external connections are to be used. But that...

You say that the pump starts up! That indicates that the pump is not supplied from the boiler as is intended. ( that was the way of doing things in the days of cast iron heat exchangers before low water content boilers became the norm. ) This is so that the boiler can supply pump over run and...

But is there really any advantage having glass when light is not needed? Surely plywood would be as good for a fraction of the cost?