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Variable flow Water Pump for instant water heater?

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Discuss Variable flow Water Pump for instant water heater? in the Bathroom Advice area at Plumbers Forums

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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?
 
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Its more than sufficiant, youre not replaceing that water with mains so the lowest it would ever drop to would be room temp.

you only need the immersion to keep the temp up.
initually you need to leave it for a few hours to get up to temp but then it tops itself up.
that usually happens once.
unless you want to be special and turn it off after every use.
 
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The reason storage heater so popular is because it use the power during the off-peak electricity in the night time,
It is good for government and power station but not good for user.

Cause the power station need to make sure able to provide the electricity at the peak demand
And most power station cant vary their output in short time ,like nuclear power station,
which is cheaper to run than those can vary output in short time, like gas power station
This mean government can end up building less power station.

Otherwise if the government set the domestic electric supply standard to 3phase 100A per phase
everyone will go to get a 3phase instant water heater which give enough hot water any time
no one will even bother to install a massive water tank which need to maintain,
cost more to transport,install and waste power to keep the temp

Does it explain it better now?
 
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Gray0689:

If you like storage, your choice.
I dont like it. Used storage heater for 9 years and never happy about it.

But you dont ban people who not agree your opinion, I dont force anyone to install a instant system,
if you love waiting the water to boil, I dont stop you to do it.
Please respect other opinion!
How can keep saying unvert awsome, unvert great help? It is more like an unvert religion rather than the actual reason to support it.
It seem Only with detail/spec of the model are meaningful advise.

most ppl advise unvert just because they install more unvert than other system, a system easy to install doesnt mean good to use.
As I said above I explained why unvert storage set up is popular, but the advantage are only for the power company and the plumber install it, not the user.

If anyone can give a exact model/detail of set up for an electric powered unvert system that dont run out hot water in 2hours shower and take less than 20min to reheat,
I will apologies to each indivial member who recommended an unvert system.
 
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You are talking utter nonsense
The power you will need to have the water heated at the flow you want is only attainable by a boiler or a stored water heater ie direct unvented cylinder you have been told this on lots of occasions but choose to ignore the advice
You have been told not to do what you did as wont work
You did it anyway
Then come back asking advice on how to fix it
Case closed and I hope the thread lmao
 
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DuckyUC said:
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.
Click to expand...

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
 
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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
 
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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.
 
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DuckyUC said:
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.
Click to expand...

What are you on
 
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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.
 
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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.
 
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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.
 
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