Mainsboost for unvented system

[Jerry]

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]

 

[Stants]

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]

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.

 

[chris watkins]

I’m on the cusp regarding pressure and flow rate

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)?

 

[Stants]

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

 

[Riley]

Pressure will drop by nearly 0.6 of a bar going up that distance

 

[chris watkins]

Flow rate measured may have been limited by the supply hose on the kitchen tap, try to get a full flow 15mm mains reading.

 

[Stants]

Flow rate measured may have been limited by the supply hose on the kitchen tap, try to get a full flow 15mm mains reading.

Pressure will drop by nearly 0.6 of a bar going up that distance

Yeah was told on the earlier post 0.1 per metre

 

[Stants]

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 ?

 

[chris watkins]

Yeah was told on the earlier post 0.1 per metre

Yes.
So pressure will be OK, you just need to workout if you can live with the flow rate you have or you could investigate the other options.
If you have room I would go for accumulation tank.

 

[Stants]

Yes.
So pressure will be OK, you just need to workout if you can live with the flow rate you have or you could investigate the other options.
If you have room I would go for accumulation tank.

Thanks do you have any more info about an accumulation tank makes sizes etc

 

[chris watkins]

https://greatwater.co.uk/uploads/BAM_brochure.pdf

 

[Stants]

https://greatwater.co.uk/uploads/BAM_brochure.pdf

Cheers

 

[MOSSEP]

Ive fitted a mains boost system, worked well but took up a huge amount of space. From memory they provide as volume of water rated at half of its size, so a 300l mains boost will provide 150l of water. If you have the cash and the space then they are as viable option.

 

[SalamanderPumps]

The other possible solution would be to fit cold water storage cisterns, from there you could use a couple of decent single impeller negative head pumps to pump from the cold water tank. One pump could supply the cylinder and the other could supply all non-potable outlets, something like the Salamander RP80(or 120) SU's.

We also have an accumulator offering, called AccuBoost, but this won't be available until around September.

If you need any further advice, please feel free to give us a call on 01915162002

 

[moonlight]

You can fit a homeboost max 12 l/min

 

[chris watkins]

The other possible solution would be to fit cold water storage cisterns, from there you could use a couple of decent single impeller negative head pumps to pump from the cold water tank. One pump could supply the cylinder and the other could supply all non-potable outlets, something like the Salamander RP80(or 120) SU's.

We also have an accumulator offering, called AccuBoost, but this won't be available until around September.

If you need any further advice, please feel free to give us a call on 01915162002

View attachment 38623

Notifiable under the Water Regulations if you go this route.

 

[OffshoreGas]

If you fit for example a 300L accumulator and pump you could probably expect to get 200L out. How long it will boost and how long to refill will depend on your water supply.

Say you have 10L/m from mains and want to boost to 15L/m the tank could supply for 40 mins constantly (200L / 5L/m). The tank would then have the full mains (10L/m) recharging the system so should be replenished in 20mins.

In a more normal example a person having a 10min shower, the system will most likely have refilled by the time they’ve dried/dressed.