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If I may ask. ?

Now your just showing off . :D What type of insulation is that on the pipes in the second photograph.?

simond wrote Do you have any idea who invented the accumulator ?. I have neighbours who have them installed to boost supplies. One guy (a long distant lorry driver) purchased his in Germany and fitted it himself. A grundfos model , and for about half the cost of UK suppliers...

Philthefrog wrote No problem. Dont tell lies.

Simond Wrote I guess I could botch you one up. I have done some metal fabricating before. It looks easy looking at Doitalls photograph. Just weld stop ends on a big pipe and a few stubs. Why would you want to purchase such a device from Viessmann anyway. Sounds expensive. But...

Doitall Wrote WHY. ? Whats that big vertical tube in the corner ?? . Still looks like a waste of good steel and its scarce enough as it is what with China using up all the supplies and what have you.

Philthefrog. Which port on the Warix flange is connected to the pump ?

Simond You obviously have a non-impartial view with regard to the accumulators as you install them and recieve payment for their fitment. However pushing them like a salesman on an open forum is usually not well recieved by others who understand what can and cannot...

Philthefrog wrote Someone may have mentioned it but these pipes sound much too small. Do the manufacturer recommend 15mm. I doubt it. :( Any pump I have ever seen has a much larger pipe on the inlet compared to the outlet. Have you calculated the NPSH required for...

Philthefrog wrote Where does the air come from. Surely a vacuum will be formed ? Are you saying the water is air entrained or something and the impellers draw this air entrainment out.

OOPs Sorry softus. I thought this was the first post you were referring to. I should read them better.

softus wrote Where did he write this or did you just make it up ?.

simond said . Positive. Have a look here - :wink: http://www.diynot.com/forums/viewtopic.php?t=51701&postdays=0&postorder=asc&start=255

OK ,own up how many of you plumbers have lashed a few gallons of this (or similar) http://www.dunsleyheat.co.uk/oxypic.htm into a customers heating system unbeknown to them in the hope of sealing a dodgy soldered joint. :(

Looks like a lot of steel just to pipe up a couple of small looking boilers. :( Would less not suffice and still do the job ?

To cut a long story short geez, simond recomended an accumulator which is a very expensive option and the OP after much deliberation opted to have his mains pipe increased in size and it solved his problem. :P

simond said Underfloor pipes are heating pipes so why not sleeve these also so that they be removed. Its just I am interested in this UF malarky and may be doing a few installs and wish to get it right.

Pray tell, whats a low loss header ?

Chris hutt. Sorry about that previous post. I had confused upstream with downstream and didnt look at your diagram. I imagined upstream to be on the outlet side of the pump. :(

Chrishutt said I am in agreement with Doitall. He certainly seems to know what he is talking about. Moving the expansion vessel upstream of the pump will not cause the pump inlet pressure to increase. Can you explain how this will be the case ?. You are simply giving the pump an...