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I wouldn't pay them anything. Rather put it towards cost of alternative.

Are you expecting someone to visit and tell you what's wrong for free then?

I don't suppose it occurs to you that Vaillant won't have to buy their parts at anything like the ridiculously inflated prices they sell them to the trade for.

He's opened that many identities that I sometimes have to check to make sure who I am.

You can't clean the heat exchanger on a 30hxi.

There is no friend, gas valve or Potterton 28. Just DrDrivel, WaterSystems BigBurner, etc etc on another wind up.

Make sure you've adequate ventilation. If so and it's still a problem, try opening window/doors to outside on lighting.

The 240 is conventional (open) flue and will kill you if allowed to burn with a sooted heat exchanger. Assuming this isn't a wind up.

Oh dear, Dr Drivel back again. What happened to the Vokera SE you had fitted in your last post/alias?

If you're happy to stick with your gas man, ask him to join the RGI section of this forum. People there may be able to offer detailed advice.

None of that has anything to do with what's meant by oil pressure. It requires adjustment of the burner (and possibly changes to adjustable baffles if applicable) and re-commissioning using the correct instruments.

I would look for over 2 bar dynamic and 18l/min as an absolute minimum. Generally over 3 bar and over 20l/min with a 25mm inlet from the street before I can sell it with confidence. I'd refuse the job based on your figures even if you wanted to chance it. Best stick with stored, you can get...

Why don't you look at the title of your post again and at the replies from others that are the same or agree with mine. Don't blame me because you come across as a pointless punter. Like I said try your methods out on the trade. That's what YOU posted to ask opinion for.

You chose the question about approaching people in the trade, but don't take my reply. Phone some installers (even British Gas & the like), tell them you begrudgingly might spend some money with them. Then mention you're on a tight budget so have an idea to reuse the old flue and supply your own...

OP- You can ask whatever to whoever you like. If I were approached with phrases such as 'having a new kitchen', 'begrudgingly', 'reuse existing flue', 'buy boiler myself' etc... My advice would be the same. If you don't want to buy, don't buy.

You can't use any part of the existing flue. If your budget is so tight as to make you consider dangerous bodge methods, then you're best advised not to change anything.

It can. SGM has already explained how.

The pellets in bulk dry storage are even known to give off carbon monoxide. There may be special considerations for store rooms on top of just damp proofing. Then there's the volatiles/particles given off when burning. As a manufactured product, distributed by road and often imported, the...

At just over 4p per kW, oil is much cheaper than pellets at 6 to 7p per kW. Wood pellet and wood chip boilers in their current development stage are no use for individual domestic properties. For communal or commercial projects, they are an option worth considering.

Do you require any plumbing advice? If you just want to debate about money, you're on the wrong forum.