Variable flow Water Pump for instant water heater?

[DuckyUC]

Hi again

I fitted a instant electric water heater to supply hot water for whole flat
but the hot water flow are quite low

So I am finding a pump that can:

1. pump only on when water flow
so no pump noise all the time and the pump have longer live

2. pump can tune how much water flow/pressure to increase
the water heater have a max 10bar Rated pressure
If the water flow too high the water heater wont able to heat up the water to require temperature

I find a pump call Salamander home boost on google
It only on when water flow but it design to maintain 12L/min all the time so I do worry that will give too high water flow and the water heater wont able to heat up the water to require temperature.

Any recommend for water pumps?

 

[DuckyUC]

The instant heater normally place within 2M from the shower head, as I place it in boiler room the hot water pump can restore the pressure lost when the water pass through the pipe.

 

[Koogatubac]

This topic is awsum, i want in!

 

[Gray0689]

The instant heater normally place within 2M from the shower head, as I place it in boiler room the hot water pump can restore the pressure lost when the water pass through the pipe.

No problem
Ill see you when your back asking how do I get the water hotter after I have added a pump to system
Look forward to reading it
Now I'm out lol

 

[Dotty]

I might start taking an entrance fee!

 

[AWheating]

using your maths you are going to shower with 60degree hot water if you have an unvented cylinder? if so then your maths is correct but the third person wont be able to have a shower, they will be too busy taking the first two people to the burns ward of the local hospital.

chrispy duck LOL

or should i say chrispy duckyUC

 

[Dotty]

And as for differences of opinion......

Only really works when both parties know what they're talking about.

 

[DuckyUC]

The pulsa coil boiler do have an internal hot water pump to increase the pressure too, I cant see the why install a hot water pump will cause problem for the instant heater.
Since the pump can tune the output, I can get the increase pressure at the level I need without temp drop too much.

If you say no to the set up, please give a physical reason to it. Otherwise that will become the fight of religion again.

 

[Gray0689]

The pulsa coil boiler do have an internal hot water pump to increase the pressure too, I cant see the why install a hot water pump will cause problem for the instant heater.
Since the pump can tune the output, I can get the increase pressure at the level I need without temp drop too much.

If you say no to the set up, please give a physical reason to it. Otherwise that will become the fight of religion again.

What are you on

 

[AWheating]

phone the manufacturer of the heater up and ask them.

 

[DuckyUC]

Gray0689:

For your problem , that is why I need a pump can tune the output to stop excess cold water flow.
Even In the worst case the pump wont make difference, but if the plan work then the whole system are way better than the storage idea.

 

[DuckyUC]

AWheating:

even you get 60C in the unvent that will only store 10-15% more heat then a tank @ 55C
It may change from 40min shower to 50min shower, but then it will take even longer time to heat up the whole tank.

And for instant system you mix the hot water with cold water, at least the chance of the unvert blow up are more likely then I go to hospital.

 

[DuckyUC]

Unvent the best!

 

[DuckyUC]

Why not give a suggestion of the best unvent system physically exist? much more easy to discuss the performance etc.

 

[DuckyUC]

Having difference opinion is the point of the forum and discussion, if everyone have the same opinion all post will finish in 1 reply.

Unvent the best!

 

[AWheating]

going to your level reasoning for a min, does the third person stand outside the bathroom for 40mins, seems like a waste of time to me.

maybe some diversity to your military routine is needed.

 

[Killy Bing]

Unvented isnt always the best....but for your limitations its your only real option

anything you attempt from this point on will be unsafe as you don't understand the limitaions of what our trying to use.

as such im having no part of it.

install an electric shower thats the safest option......for everyone.

 

[DuckyUC]

AWheating:

With an unvent system the 3rd person need to wait 3hours.

 

[DuckyUC]

1king55:

The instant water heater is a electric shower really.

 

[Killy Bing]

Have you not realised that water heater you got reduces the flow to get its temp rise..... Boosting it before will either have no effect or bust it.
boost it after and the pump and water heater will run dry.

electric shower is at the point of use and designed for use for a shower.

you've probably got a sink heater...

 

[johnnyplumb]

Our Father, Who art in heaven
Hallowed be Thy Name; thy kingdom come ...... lol

 

[DuckyUC]

I know the heater restricted the flow to heat the water to designated temp
Place the pump in cold inlet will have no effect

So I try to get the pump install in the hot outlet
get a tune-able pump, Set the pump at lower power to avoid the heating element run dry

It wasnt those high power main boost pump, it is similar to those pump build in storage cylinder which boost the pressure.

 

[DuckyUC]

it is 12kw and are design for shower, def not sink heater,which normally is 3kw.

 

[AWheating]

albion ultersteel direct unvented cylinders, page 6

http://www.albionwaterheaters.com/pdfs/sales/ultrasteel.pdf

120 L cylinder has a recover time of 45 mins with 2x3kw heater
150 L cylinder has a recovery time of 61 mins with 2x3kw heaters

these will be simular figures of other cylinders

also remember the cylinder will start to recover during the first shower not after the second.

so admit your wrong and stop talking rubbish.

 

[stoker122]

38 degrees generally for a shower (can't believe I got sucked in!)

 

[DuckyUC]

2 shower running at the same time, heating recover from 1st shower already involved in the calculation.

120L/5 will last 24min recharge 45min
210L/5 will last 42min recharge 96min

Thanks for giving the information to support what I said before.

 

[DuckyUC]

normal shower about 38c-42c

 

[DuckyUC]

2 standard bath need 210L for direct unit according to the product info you provide.
Which take 96min to reheat, with 5L/min last about 42min.

So far it seem the instant set up still better, wait for 2*20min shower only take 40min.

 

[AWheating]

2 shower running at the same time, heating recover from 1st shower already involved in the calculation.

120L/5 will last 24min recharge 45min
210L/5 will last 42min recharge 96min

Thanks for giving the information to support what I said before.

2 showers at the same time with 5lpm from a electric heater?

so why did you say 3 hours in another post, your an idiot.

please dont kill anybody but yourself, terra a bit. :banghead:

 

[DuckyUC]

3hours for the 3rd person to wait, can you read before comment?

 

[stoker122]

No normal shower 38 as that is the safety point, if you want it hotter you would need to press a safety switch to unlock to stop people getting burned.
What are you showering, lobsters?