Only getting trickle of hot water

M

misguided fool

Joined
27 Dec 2004
Messages
25
Reaction score
0
Location
Ipswich
Country
United Kingdom
hi
i had a new Glow-worm cxi24 boiler fitted yesterday.

The central heating is working fine and i can have hot water in the taps downstairs. I have a mixer tap with shower attachment on the bath. When I tried to run a bath this morning i could only get warm water through the bath tap. If I turned the tap down to just a trickle it will then get hot.

Any idea why
 
Sponsored Links
Your boiler is only 24 kW which I would not recommend for anyone who wants to take baths instead of showers.

It can only heat about 8 litres per minute to a temperature which you can just keep you hand in.

Measure the flow rate and you will probably find you are expecting too much from it.

Didn't the installer recommend a 30 kW model? Thats the minimum most quality installers would expect to fit nowadays.

24 kW boilers are usually only fitted by mean landlords!

Tony
 
Agile said:
Your boiler is only 24 kW which I would not recommend for anyone who wants to take baths instead of showers.

It can only heat about 8 litres per minute to a temperature which you can just keep you hand in.

Measure the flow rate and you will probably find you are expecting too much from it.

Didn't the installer recommend a 30 kW model? Thats the minimum most quality installers would expect to fit nowadays.

24 kW boilers are usually only fitted by mean landlords!

Tony
Click to expand...


your assumptions amuse me Agile.

I fit plenty of 24kw boilers and have very little complaints. After all there are plenty of houses round here where the flow on the cold water is about 10 litres a minute max...........Would you put a 28kw combi on that and rip the customer off for no extra benefits.........or does it depend on if he makesyou a cup of tea??

24KW boilers are fine, no problems with them, they just need to be commisioned correctly with the correct water throttle set and the customer instructed and they are no problems at all.

Im not saying in the right place a higher output combi is the correct way forward but 24kw boilers do have a place.
 
Sponsored Links
Yes, of course I agree if the water flow rate is poor then a 24 kW is all that is justified.

However, as it appears that the flow rate is good then a larger boiler should have been fitted.

No bath taker wants to have to wait 15 minutes for their bath to fill at this time of year.

If the owner really only wanted a 24 kW boiler then they should have been instructed about the limitations beforehand and the DHW flow rate adjusted down closer to what the boiler can heat. Few poor quality installers ever do that in London though.

Tony
 
thanks for the info

i had suspected that the boiler was just not capable of producing enough hot water hence the post.

i got 3 quotes when i first deceided on the job and explained to them my previous boiler (a worcester 240) did not give me enough hot water.

i was told that heat exchange was prob faulty and as boiler 10+ years old would be best to get new one. I asked plumber to confirm that new boiler would solve problem and was told yes.

i was told it would be best to get boiler with 12l flow rate as old was only about 8 and so would get a 50% increase in flow.

When plumber arrived to fit yesterday i saw 24kw on box and questioned him then if it would give me enough hot water. he told me output would be 10l and should be plenty.

should i now insist he takes it away and fits the cxi30
 
Where you not told size during quote if so dodgey ground. But personally if everything is set up correctly and i was not getting far better hot water delivery than before and was promised it would be i would kick up shi#e.

Bath mixers with shower attachements are a pain for delivering slow hot water . Also supply to bath is prob 22mm so it won`t look as powerful as it comes out but you get same amout of water
 
didnt i read earlier the downstairs is fine? boiler must be ok, just throttle it back a bit for bath tap that is letting out more water than the others.

AND dont you think most people will when running a bath turn a tap on full, other taps are turned till wter comes out, never usually on full hence the problem grows!!
 
I can see all points here and I would also question whether boiler has been commissioned properly (not disagreeing with you kevplumb!).

As you seem to have been present and watching installer did you see him run any tests at gas meter. If working pressure is low then you won't have a chance.

I cannot understand why if you were expecting a 28/30Kw combi and wanted this flow rate, why you did not insist he took the 24Kw back and fitted the larger one instead? Or did you not want to pay the greater price? which you have done now :rolleyes:

Personally I never fit 24Kw but agree, in certain situations could be ok
 
hi thanks for all the advise.

the hot water supply to the bath is in 15mm all the way from the boiler.
i understand that the flared outlet on the bath mixer will not create the back pressure of a tap, but i would have expected to be able to turn it on more than 1/2 a turn and still get hot water.

I have also re-checked the downstairs taps and the bathroom basin, these taps only run hot at half throttle, which is not a problem when you only want a washing up bowl full or a basin to wash in. However taking 15 mins to fill the bath using just the hot tap is.

i did question the 24cxi when it was still in the box and assured it would give me 10l, which will do fine. so although i had reservations i allowed him to continue. Unfortunately i a chef not a plumber so i accepted his option as being the one with the greater knowledge of boilers.

He did attach something to the gas meter when he was installing the boiler, i know not what. However i cannot give you any figures as he has not yet completed the commisioning paperwork. He intends to do this on monday when he returns to replace the room thermostat, which he could not get to work on thursday. Apparently i have the wrong type and it must be replaced.
 
15mins to run a bath from a combi is to be expected and i honesty beleive that even with a 30kw boiler you would not be happy. You seem to be expecting too much (particually this time of year when the mains is at about 5 degrees) If hot water at the bath was such an important point for you , i belive that a combi may not have been your best option. The shower no doubt is fine or would be if you need one. How much water does one need for washing up and washing hands????
 
Yes - on from Kev's point, you may want your shower at 45 degrees, so you only get 8 litres/min at that temperature rise.
Traditional old bath taps working from a tank in the loft above and a HW cylinder will give you maybe 30 litres/minute, combined to fill a bath. You can't get anywhere near that with a normal combi.
 
D

DIYnot Local

Staff member

If you need to find a tradesperson to get your job done, please try our local search below, or if you are doing it yourself you can find suppliers local to you.

Select the supplier or trade you require, enter your location to begin your search.


Are you a trade or supplier? You can create your listing free at DIYnot Local

 
You must log in or register to reply here.
Sponsored Links

Similar threads

H
Hot water down to a trickle
Replies
3
Views
2K
gas4you
G
P
Hot Water a trickle from a mixer tap
2
Replies
15
Views
9K
Ivansplumbing.co.uk
I
C
new taps fitted now hot water one is only a trickle
2
Replies
17
Views
12K
chris38
C
H
hot water a trickle
Replies
3
Views
717
hendrik
H
F
No Hot water Flow
Replies
0
Views
862
frogo
F
Back
Top