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- 14 Dec 2006
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Hello everyone
i'm having my whole central heating system replaced from an old open vented system with microbore pipework to a new combi system with the boiler moved to the airing cupboard, by a 'professional' council approved company.
The bolier i have chosen is the ecotec 837 plus, primarily because of the high flow rate (we tend to use many taps at once in our house). we've got an a bathroom/ toilet with an electric shower plus another seperate toilet dowstairs.
I have a few questions if any of you kind guys could help me out:
1. the installers/ plumbers have used plastic hep20 pipes under the floorboards (the pipework looks very messy), is this recommended? and what are the chances it could leak? plus they haven't insulated the pipework under the floorboards downstairs - they say these pipes are already thermally insulated, do i still need foam insulation? (this is what hep20 say: http://www.hep2o.co.uk/v2Othermal.htm)
2. the other thing is that the DHW outlet from the boiler is a 15mm coper pipe, however they have connected this to the rest of the hot water system using a short piece of hep20 pipe, which has a much smaller inside diameter.
Like all physiologists i look at things from a scientific perspective, and according to poiselles law, flow is proportional to the cross sectional area of the pipe squared for a given pressure drop. hence the smaller pipe would theoretically limit the flow rate(and so the expesive bolier would become a waste of money). ive tried explaining this to the plumber but he doesn't seem to understand and says that this doesn't affect my boiler because my boiler has a high flow rate?!?!?!?
they have done the same thing for the mains cold water inlet into the boiler, which itself is tapped off from the shower's water supply - i'm a little worried because if when i'm having and someone opens a hot water tap or flushes the loo, will this cause my shower to go cold or reduce flow on the boiler's DHW flow?
We are paying this company a lot of money to do this job and we want to make sure its done properly? i really hate telling builders/ plumbers/ engineers how to do their job...but i'm the one who will have to live with this and so i might as well get it right first time.
could someone please advise?
cheers...sorry for the long post and waffle
i'm having my whole central heating system replaced from an old open vented system with microbore pipework to a new combi system with the boiler moved to the airing cupboard, by a 'professional' council approved company.
The bolier i have chosen is the ecotec 837 plus, primarily because of the high flow rate (we tend to use many taps at once in our house). we've got an a bathroom/ toilet with an electric shower plus another seperate toilet dowstairs.
I have a few questions if any of you kind guys could help me out:
1. the installers/ plumbers have used plastic hep20 pipes under the floorboards (the pipework looks very messy), is this recommended? and what are the chances it could leak? plus they haven't insulated the pipework under the floorboards downstairs - they say these pipes are already thermally insulated, do i still need foam insulation? (this is what hep20 say: http://www.hep2o.co.uk/v2Othermal.htm)
2. the other thing is that the DHW outlet from the boiler is a 15mm coper pipe, however they have connected this to the rest of the hot water system using a short piece of hep20 pipe, which has a much smaller inside diameter.
Like all physiologists i look at things from a scientific perspective, and according to poiselles law, flow is proportional to the cross sectional area of the pipe squared for a given pressure drop. hence the smaller pipe would theoretically limit the flow rate(and so the expesive bolier would become a waste of money). ive tried explaining this to the plumber but he doesn't seem to understand and says that this doesn't affect my boiler because my boiler has a high flow rate?!?!?!?
they have done the same thing for the mains cold water inlet into the boiler, which itself is tapped off from the shower's water supply - i'm a little worried because if when i'm having and someone opens a hot water tap or flushes the loo, will this cause my shower to go cold or reduce flow on the boiler's DHW flow?
We are paying this company a lot of money to do this job and we want to make sure its done properly? i really hate telling builders/ plumbers/ engineers how to do their job...but i'm the one who will have to live with this and so i might as well get it right first time.
could someone please advise?
cheers...sorry for the long post and waffle