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]

omg, I find it.
Triton T450i 1.2 Bar Single Impeller Positive Head Shower Pump

Seem fit my need

 

[DuckyUC]

triton got bad review on 1st page in google, any other model recommend?

 

[chris watkins]

:smilielol5:This little job is getting more & more costly by the minute. :smilielol5:

 

[AWheating]

so the heater we said would not be good enough and have a good enough flow rate is........................... not good enough and does not have a good enough flow rate ?
:19:

increasing the flow will make your hot water cold.

 

[DuckyUC]

the water heater have a max temp of 55C set by it thermostat, so I want to increase the water flow to a point until the water heater cant heat any more water

 

[DuckyUC]

for now the hot water amount restricted by the low water flow, whatever how low the water flow the max temp is 55c so it is potential able to generate more hot water by increase the flow

 

[DuckyUC]

just tested when i set the temp at 20c and 55c the water flow are the same, so the shower are not reduced the flow to achieve a higher temp

 

[Mike Jackson]

Fit the Salamander home boost or the Suart Turner Mains boost and put a restrictor just before the pump.

 

[DuckyUC]

Good idea,
I find [h=4]Grundfos UPA 15-90N[/h]Which is cheaper and
1. do have flow switch
2. able to turn the output

I find it cost £131 online will this be a good option?
The only bad thing is Salamander home boost able to fit on the water main but [h=4]fit Grundfos UPA 15-90N need consent from the water supply company (I guess they wont say no as long as the pump draw less than 12L/min water)[/h]

 

[Mike Jackson]

They will say no as it's not an approved product. Both of the pumps I listed will only turn on when the tap is opened. They are suitable because they have flow limiters built in. Unless you look at fitting break tanks there are only two pumps that are suitable at the moment.

 

[Howsie]

The good option would have been to get a qualified plumber to assess your need and provide a solution. What you seem to be doing is throwing bad money after bad.

 

[SimonG]

Why is anybody responding to this blokes posts now. This is the third post along the same lines, advice has been ignored and he is now trying to get something cobbled together.

I know the forum is here to help, but in the odd instance some people are beyond help.

 

[DuckyUC]

Thanks mike, I think I will go for Salamander home boost+ restrictor solution.

If I get a contractor give me a solution without understand what happen they often provide some solution seem ok before they leave then find more problem after. As I do found a a qualified plumber to fit the water heater already, dont want to waste the money again, the labor is like 2-4 times of the material itself.

 

[DuckyUC]

So each member only allow to open one post?
All 3 post are difference problem really.

 

[DuckyUC]

If I open 3 post ask 3 exactly the same question then you are right. If I want get instant access to hot water how does those advise me to install a immersion help? Think about it, will you buy a car that take 2hours to charge before it run and the battery only last 40min? If everyone prefer a car can run anytime why not for the water heater?

 

[SimonG]

So each member only allow to open one post?
All 3 post are difference problem really.

?????

 

[SimonG]

If I open 3 post ask 3 exactly the same question then you are right. If I want get instant access to hot water how does those advise me to install a immersion help? Think about it, will you buy a car that take 2hours to charge before it run and the battery only last 40min? If everyone prefer a car can run anytime why not for the water heater?

This is a great example of how not to manage a project in your home.

Ask advice, ignore advice, buy unsuitable product with no thought to installation or long term operation, employ plumber/electrician to install unsuitable equipment, blame plumber/electrician for equipment not supplying sufficient hot water (as was advised on numerous occasions), look for pump to fix screw up that probably won't anyway.

I'm off in the shower now with ample hot water.

 

[chris watkins]

This is a great example of how not to manage a project in your home.

Ask advice, ignore advice, buy unsuitable product with no thought to installation or long term operation, employ plumber/electrician to install unsuitable equipment, blame plumber/electrician for equipment not supplying sufficient hot water (as was advised on numerous occasions), look for pump to fix screw up that probably won't anyway.

I'm off in the shower now with ample hot water.

Would that be a shower fed with hot water from an un-vented storage cylinder SimonG ???? I bet it has a good flowrate as well & how much did you say it cost to supply & install was it £400 or did you go for the more expensive one at £600 !! L very much OL.

 

[DuckyUC]

I used an un-vented storage cylinder before, hot water last 40min and take 1-2 hours to boil once hot water run out.
The point is get unlimited instant access of hot water, how your advise able to do so?

The wiring upgrade only one off cost, and in the future repair/replace the instant water heater + pump only take 30min.
The storage heater you recommend, not even able to drain the water in 30min and start any meaningful repair.

 

[chris watkins]

I used an un-vented storage cylinder before, hot water last 40min and take 1-2 hours to boil once hot water run out.
The point is get unlimited instant access of hot water, how your advise able to do so?

The wiring upgrade only one off cost, and in the future repair/replace the instant water heater + pump only take 30min.
The storage heater you recommend, not even able to drain the water in 30min and start any meaningful repair.

If you say so, end of my communications.

 

[Killy Bing]

Well ducky!!

if you increase the flow through a an instant hot water heater of any sort it means less time for it to heat !!

therefore if you increase the flow rate now you will have........lukewarm water

sadly you have gone down the wrong route to begin with..........the advice you have recieved and ignored from the first post has been solid !
This is our job so its very naive to assume you know better.

I'm off for a two hour boiler hot shower with an amazing flow rate to drain my unventeds and then get the stop watch out for a further 20 mins to wait for it to recover

 

[DuckyUC]

how big is your water tank?

 

[DuckyUC]

Also how much was the bill?

 

[DuckyUC]

Even my current shower give 4.8L/min, you have 2hours shower so that will be at least 2 X 4.8L/min X 60min = 576L
120min+20min to heat the water, 576L/140min = 4.11L/min

How many Amp does your boiler use?