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Just wanted to thank everyone for their advice. The new Worcester-Bosch Greenstar 42CDi boiler is in and working, complete with SWEF plate heat exchanger and all is very well. Quite an amazing difference in final quotes from three companies, nearly £3k difference. I chose the cheapest, not...

OK, I'm going to specify a plate heat exchanger, and have the boiler as a sealed circuit, with replacement pumps and controls. Thanks everyone for your help, guidance, discussion and at times confusion! I have learnt a lot.

and with a LLH then it would be an open system anyway, as that is what it is now. Yes?

I wasn't planning on changing the system to a closed one. The plan is for it to stay an open system. Is that OK with all of the 3 options?

Thanks D_Hailsham for your reply. So basically what the man from the boiler manufacturer was rubbish. Where is one to go for sound and professional advice? The so called professionals that have quoted appear to be at odds, and I have had at least 4 different views expressed on the forum...

The boiler manufacturer replied to my question about the need for a low loss header. You might be interested in what was said. "I believe the reason you have been quoted for a low loss header is because you have a one pipe central heating system. The reason for this is because on a one...

Thanks, MrMethane, and gday! In my case, the boiler will be new but the pipes and radiators are old. None of the guys who have come to offer solutions have been very interested in the heating system as such. They can see the iron pipes, and accept my statement that the previous boiler got he...

Thanks, a good idea. The email is sent! And yes, my bad, shunt pump indeed it is.

Thanks, Yes, the house is a bit strange shaped, the result of at least two sets of extensions since the house was built in 1907. I put the walls as single thickness, although in fact we have, strangely, cavity wall up to downstairs window level and then single brick from there to the roof in...

May I ask your reason for why I don't need a LLH. I'm not arguing, just to know helps me understand. Why not in the house? well, we have a boiler house, which would mean a major kitchen rebuild to use the space, and that's where all the pipes currently arrive.

Thanks both. Tony, you are right in that those are my questions,and I know that to ask a price, sight unseen, is a big ask. Basically, the boiler is in a separate boiler house, plenty of space, and current pipework will have to be changed anyway, that is in the quote. To instal a LL...

I might agree with you for certain if I hadn't had two other quotes which didn't have a LLH as part of their solution. That makes me think it is either unnecessary or the other two quotes are offering me a solution that has a level of increased risk to the boiler. My frustration is that I can't...

I think that you are talking about multiple commercial boilers here, and I don't think that is what I am dealing with here. Sorry, if I have missed the point, but the relevance escapes me. Feel free to correct me though, if I have got your intent wrong.

Thanks for the link for the heating assessment tool. I went and measured all the rooms, and had to divide the house into 4 areas, which I could then treat as semi-detached. The calculations added up to 29.92 kwh, so 30kwh looks to be spot on! The system has a pumped heating circuit, and a...

Your answer comes close to what I was looking for - i.e. guidance, not a detailed technical discussion of plan / plate / KKH options etc. It would seem that a LLH is NOT required. The proposed replacement would have a filter system in in anyway, something like Magnaclean. I think I...

Sorry guys, but I'm not a heating engineer, so all the jargon, abbreviations etc I am just finding more confusing. The proposed boiler is a Broag Avanta 30V. I have no doubt that to replace more of the system might be better, and maybe a Vaillant boiler would be better than a Worcester but...

I now understand what the LL header does, but would it be needed because of the old pipework and radiators? I'm being told that if they were to replace everything, then they would design it specifically and so they would be able to match the system to the boiler correctly. Because they are...

I'm in the position of having to replace my 31 year old boiler in my large-ish detached house. The heating system itself is old, with a mixture of old iron pipes and newer copper ones, 20 radiators in all. The old boiler was a 125,00 btu, or 35KW, an Ideal CF120. I can imagine that its...