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New CH system whats ?best for house x4 plumbers told different #confused HELP

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fletch25

Ok here goes, any advice greatly appreciated and here’s our story…

Basically moved in to new house end Jan and knew it needed new boiler (15 -20years old!). It’s an old system boiler (only 87% efficiency), with hot water in airing cupboard and three tanks in loft.

House is 4 bed, 2 bathrooms (both with power showers) and 1 toilet. Total of 14 radiators (plus one extra would be added into utility)
(NOTE: the showers are virtually next to each other as bathroom backs onto the ensuite also).

The boiler itself is in the utility room and the main manifold is there too. All the pipework downstairs is below concrete floors and / or solid oak flooring. The main manifold is actually exposed in a large hole in the utility floor (wasn’t visible when we viewed house as they had shoes / boots on top of it!) and the manifold pipework is actually slightly above the concrete level and then part of the pipe is seemed to be bend under the concrete towards the boiler. Hence we don’t really have much confidence in the original build / pipework!

The bathroom hot water flow is a slow trickle (obviously just on gravity from the tank) and we’d really like to improve that – the bath is massive and takes 15 minutes to get a good sized bath! Hot water tank did run out for hot water the next morning when I had late bath, so not sure what storage capacity it has but I like lots of hot water for baths and showers. Showers are both ok as on pumps.

So we had several local plumbers round to quote us and also good old British Gas, we thought they’d tell us what’s best for the house (? Or maybe it’s what they want / like to install!) and have the following:

1[SUP]st[/SUP] – System boiler (keep set up exactly as it is)

2[SUP]nd[/SUP] – Combi (told us it wouldn’t make a difference with showers being so close together if both were on at same time) but other half is v concerned about pressurising the pipework (based on its potential shoddiness)

3[SUP]rd[/SUP] – System boiler again (recognising the prob with pressurising old pipework). HOWEVER still wouldn’t rectify the hot water pressure issue. So other half looked into thermal stores after this visit and really like the idea of one of
Them and it would solved the hot water pressure issue. This plumber then agreed this is a good option for the house later on, however didn’t know they came vented versions, he only knew of the specialist fit ones. Then told us he can install a vented one (don’t really trust the fact that he never knew about the vented ones but will install us one!)

4[SUP]th[/SUP] – BG agreed that thermal store be a good option, checked water pressure etc and all was good enough for it.

So, then we had combi man back. Explained really not keen on pressurising pipes but can see the benefits of the removal of water tanks etc, lots of hot water when we want it, not wasting energy storing hot water etc. But we are now about pipes under concrete leaking, not being able to use showers at same time/dishwasher, running taps etc. He then suggested re-doing all pipework (dropping from above, boxing in and putting in new manifold upstairs) and hence de-commissioning the potential dodgy pipework under the downstairs concrete floors. However that might work ok for the most of downstairs but we have a ground floor extension / garden room with both radiators on the opposite / window side so wouldn’t be able to “drop down” from upstairs and hence what to do with those!!!

We are so confused. Other half will ultimately make the decision, but he’s no expert (although has researched lots now!!) and we just want it to “work”, i.e. the old system is inefficient now but at least we get hot water etc. But if we had combi and then had the old can run both showers, or can’t have shower while dishwasher on (last an hour and 20mins) or run a tap etc, then that prob annoy us.

It’s just the two of us at the moment but we want a family and we’d like a CH & hot water system that will work for us now and in the future with babies / youngsters etc.

If you need to ask me any more questions, please do. Might need to confer with other half later but wanted to get this post on, so we could start receiving advice asap!
Amanda
 
Ok, a combi, probably not best solution. I would suggest you have your water pressure and flow rate examined. If you have a sufficient flow rate and dynamic pressure I would highly recommend the following system,


Heat only Ideal logic boiler on an open vent, it could be converted to a sealed system with minimal cost if system held pressure. (Open vent is subject to lots of sludge = inefficient / short life.
Weather compensator
Wilo smart pump
Zoned heating - upstairs and downstairs heating can be switched on on independently
trvs on most radiators
The best dual energy unvented cylinder you can afford.
Magna clean.

An unvented cylinder installed correctly will provide you and you family with unparalleled hot water performance (providing you have water flow and pressure)
My money always would go on ACV SLME tank it's the best u can buy and will out perform and out last any thing else on the market 100% .

I have said multi energy as at some point you may opt for solar as an additional energy supply. - it would be a good investment now before your family grows and you wallet is perpetually empty.

You should be able to do all of the above excluding the solar for what BG quoted. Where are you perhaps a forum member is close enough to give u a quote. We offer finance as many do along with a ten year unlimited warranty.
 
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i think the answers need to be based on what you can afford to spend.

a combi is prob a bad choice. i think Ermi's suggestions are very good above. If you have the money to spend the repipe as much as you can.
 
Don't have combi guy back.... Two showers being run really effects combis
unless he's planning to install a monster combi and even then i would advise an unvented cylinder.
even so from the sounds of it pressurising the central heating system doesn't sound an ideal solution.

this is gas right? And not oil?

Are the showers power showers or do they have pumps in the airing cupboard?
if you have a combi, thermal store with a hot water coil or an unvented cylinder then the pumps would need to be removed or power showers changed.

The BG quote will be a silly price for what you will get, an independent could offer the same for a lower price or a much higher spec for the same money.

I would seriously consider a heat only or system boiler with an unvented cylinder.

are you open to quotes from forum members?
 
Thermal store be a waste of your money and shear disappointment
 
Oh and to the OP please don't fit a thermal store they sweat rot and suffer with scale on an unprecedented level they have a very short life span for something that costs so much
 
Yes local Indy. That bloke might do u some deal? What's his name ? U know the one..... Turpin...... Richard..... Richard Turpin .... Oh no ray that's it.
 
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Regardless,"Your" main worry seems to be the old pipe work.
I'd renew all old pipe work...bit like putting a new engine in your car when somewhere in the back of your mind you're always going to be worried about your old brake pipes.Just my humble opinion.
 
i dont know why people worry so much about sealing systems unless the pipework is realy ropey with compresions every where ive never had much trouble, always change all the rad valves as we found them to be the weak spot if itv leaks after youve sealed it it was probably leaking before but you just werent aware
 
Oh and to the OP please don't fit a thermal store they sweat rot and suffer with scale on an unprecedented level they have a very short life span for something that costs so much

come on!
thats from B.G!!!!!!!!!!!!!
how else they going to sell cover?
 
Thanks all.
Yes we have the money to spend, and would prefer to spend adecent amount and get it sorted properly, so that at least we know it will lasta decent while (with lengthy guarantees preferred).
We are near Tamworth / Atherstone / Nuneaton way – happy forforum member quotes if you’d like to offer any.
In addition to actually sorting the heating & hot watersystem out, I would want 5 new normal radiators (mostly for cosmeticpurposes!!) and then one new rad in utility.
Didn’t actually get a price from BG (we know they’d bethrough the roof) but he came round for an hour, tested pressures (none otherdid) and said he’d need to get an more advanced installer to come and quote –although left a ball park of 4k of vented thermal store system or unventedthermal store be more due to specialist installation at 6k!
In answer to Qs:

  • Yep def gas.
  • Showers are on pump in airing cupboard (sorry Idid call them power showers), yes pumps would be removed if any of thoseoptions and then just work off the mains pressure and should be ok.
Ermi and gasman rob – Thought thermal stores seemed a goodidea, any more negative points we should know about to def put us off for goodon that option?

I guess we are, but we aren’t, worried about the pipework (onlyif put it under pressure as its all definitely under concrete or expensiveflooring and be a mega hassle if leaked) – if we went with a non-pressurisedsystem would we still need to / be advised to re-pipe or not bother then?

Ta Andy &Amanda


 
4 guys and they all sound like idiots tbh.

Especially number 2. Good job you came on here, have dodged a bullet with that guy.

System boilers are a pressurised system by the way.
 
Where are you? You need some decent advice.

Also, if there are 3 tanks in your loft, it may be that your cold water system is also fed from them, at least to bath and toilets.
 
Where are you? You need some decent advice.

Also, if there are 3 tanks in your loft, it may be that your cold water system is also fed from them, at least to bath and toilets.

Thanks tbservices. Yes there is a small header tank for the heating Boiler in the loft plus two large water tanks, one for hot water feed and the other is for cold feed to pumped showers and I think some of the other cold water outlets in the main bathroom.
Current boiler is potterton profile 80e. Heat only I guess as opposed to system type.
General concensus here seems to be that pressure in heating system is better and that unvented dhw would be our best choice...
PS in hubby of original poster
 
waiting for moderation?

Thanks tbservices. Yes there is a small header tank for the heating Boiler in the loft plus two large water tanks, one for hot water feed and the other is for cold feed to pumped showers and I think some of the other cold water outlets in the main bathroom.
Current boiler is potterton profile 80e. Heat only I guess as opposed to system type.
General concensus here seems to be that pressure in heating system is better and that unvented dhw would be our best choice...
PS in hubby of original poster
 
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Fit a heat only boiler , the expansion, prv can be added if you want a pressurised system and the pump is better off external too. U probably want about 200l ish upto 300l. A 300l SLME cylinder is 6' tall and 2' wide!!!
 
Where are you? You need some decent advice.

Also, if there are 3 tanks in your loft, it may be that your cold water system is also fed from them, at least to bath and toilets.

Hey. we are near Tamworth, staffordshire. woud welcome advice from someone who's willing to take a look at what we have. Thanks
 
Fit a heat only boiler , the expansion, prv can be added if you want a pressurised system and the pump is better off external too. U probably want about 200l ish upto 300l. A 300l SLME cylinder is 6' tall and 2' wide!!!

Thanks ermintrude! 6ft tall and 2ft wide prob would be a very tight squeeze in our airing cupboard! I think 200l prob sufficient for us :)
 
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