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Discuss Mainsboost for unvented system in the Central Heating Forum area at PlumbersForums.net

Hi all for a loft conversion I’m renewing my heating system to an unvented one ( new boiler , Mega flo or similar ) all located in the new loft space , I’m on the cusp regarding pressure and flow rate so was going to upgrade mains into house but it was suggested to me to have another tank that stores ( or helps with ) pressurised water I’ve had a look online and would it be a mains boost system ? I’m wondering if anyone had any info about these ie are they a good option / any good .. all info great fully received
Thanks
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Problem is they run out too fast
 

Riley

S. Mod
Plumber
Gas Engineer
Depends how much space you’ve got to play with. Mains I think would be preferable if water hoard can confirm that by doing so you are likely to achieve a better flow and pressure
 
Depends how much space you’ve got to play with. Mains I think would be preferable if water hoard can confirm that by doing so you are likely to achieve a better flow and pressure
Depends how much space you’ve got to play with. Mains I think would be preferable if water hoard can confirm that by doing so you are likely to achieve a better flow and pressure
Yeah it was suggested I could upgrade the mains and still be no better off if there was a bit of a surge for water ie mornings and evening
 
Depends how much space you’ve got to play with. Mains I think would be preferable if water hoard can confirm that by doing so you are likely to achieve a better flow and pressure
I think I could make enough space but depending how big the cylinder would be I guess I would end up in the property with one bathroom and a shower in the loft so it’s not massive
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
I haven’t given up it was just suggested as an idea it’s possible rather than dig up the garden about 40 foot to put the new mains in
Mole it ?

Only need two holes then
 
The basic problem here is our increasing mains water useage.
We Uk get thro 250 litre per day UsA 400 plus and we are headed in that direction. So the short term solution is to fit decent mains suction pump
eg Grundfos wras approved. stuff the upgraded water main.
But when your neighbours get theirs installed you will be back to square one. Then get a wider mains supply installed ..loads of £ then your neighbours do same ...back to square one again. Now do not think I am a greeny etc I am not, just explaining how your journey will unfold...Rob Foster aka
centralheatking...high level intermediate water storage is the answer....ie the old vented conventional domestic heating and hotwater production system
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
The basic problem here is our increasing mains water useage.
We Uk get thro 250 litre per day UsA 400 plus and we are headed in that direction. So the short term solution is to fit decent mains suction pump
eg Grundfos wras approved. stuff the upgraded water main.
But when your neighbours get theirs installed you will be back to square one. Then get a wider mains supply installed ..loads of £ then your neighbours do same ...back to square one again. Now do not think I am a greeny etc I am not, just explaining how your journey will unfold...Rob Foster aka
centralheatking
Only boost it to 12lpm so no good to anyone
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Mole it ? Is that like a small tunnel boring machine ?
Yes And then pull the pipe back with it once your though

Exactly like a tbm but it pushes the / goes though
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Silly question would I just google company’s for a quote etc
You can or ask the water board for there approved contractors list if they have one (they should)
 

Jerry

Gas Engineer
Upgrade the mains. Adding anything mechanical to the system just introduces another (possible) point of failure (in the future).

Short term pain, for long term gain.

...bit like Brexit?

[Runs away]
 
Upgrade the mains. Adding anything mechanical to the system just introduces another (possible) point of failure (in the future).

Short term pain, for long term gain.

...bit like Brexit?

[Runs away]
Lol I see what your saying go for the mains upgrade (schhh don’t mention the b word )
 

chris watkins

Esteemed
Plumber
The basic problem here is our increasing mains water useage.
We Uk get thro 250 litre per day UsA 400 plus and we are headed in that direction.
250 = 178 if you are on your own down to 109 per person per day for family of 4 (source - Southern Water tables of usage)
UsA 400 plus and we are headed in that direction - no we are not, the following is from AD Part G2 of the Building Regulations (2016)

Water efficiency of new dwellings
36.—(1) The potential consumption of wholesome water by persons occupying a new dwelling must not exceed the requirement in paragraph (2).

(2) The requirement referred to in paragraph (1) is either— (a) 125 litres per person per day; or
(b) in a case to which paragraph (3) applies, the optional
requirement of
110 litres per person per day,

as measured in either case in accordance with a methodology approved by the Secretary of State.

The intension is to reduce it to below 100L over time.
 
What was/is the current flow rate at mains outside tap if you have one or kitchen cold tap, if you don't.
What is the static mains pressure in the morning (if poss between 7 - 8am)?
Hi Posted about this a while back just took this from the post although it wasn't in the morning this is the link to the post in full

Flow + Pressure Test


Stants Member
Hi
Just done a Flow and pressure test
Flow 3,3 L in 10 secs =19.8
( did it 3 times pretty consistent)
Pressure 4 Bar
This however was at kitchen sink downstairs but looking to install Unvented Cylinder ( santon or Mega or similar) in loft ( servicing 1 bathroom + 1 onsuite ) will/ is this going to decrease by much going up approx 5.3 mtrs ( 2 storeys ) I think the pressures ok but the Flow may be on the cusp ?? Any thoughts
Thanks
 

chris watkins

Esteemed
Plumber
Flow rate measured may have been limited by the supply hose on the kitchen tap, try to get a full flow 15mm mains reading.
 
Flow rate measured may have been limited by the supply hose on the kitchen tap, try to get a full flow 15mm mains reading.
So are you saying it may be restricted because of the tap ? And I’d get a better flow if taken directly off the 15 mm pipe ?
 

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