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Discuss newcombi-boiler size in doubt in the Plumbing Forum | Plumbing Advice area at PlumbersForums.net

just fitted a gloworm 24 kw into a flat with 6 rads one bathroom previous boiler were a 42 kw floor mounted ancient Worcester .

client wanted wall mounted new boiler, only problem now is the flow rate too much for the boiler and full the water is luke warm did think of reducing the flow but the client likes a bath . would fitting 35kw combi be the answer. Help...
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
combis come with flow reg devices already installed so not too much flow
 
OP
K

KTM

combis come with flow reg devices already installed so not too much flow
combis come with flow reg devices already installed so not too much flow
problem occurred when we run the taps opened them too much and the water temp dropped from 60 deg to 45 deg , the taps are very old.
Post automatically merged:

problem occurred when we run the taps opened them too much and the water temp dropped from 60 deg to 45 deg , the taps are very old.
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
problem occurred when we run the taps opened them too much and the water temp dropped from 60 deg to 45 deg , the taps are very old.
Post automatically merged:

problem occurred when we run the taps opened them too much and the water temp dropped from 60 deg to 45 deg , the taps are very old.
what kind of taps ? mixer taps?
 
OP
K

KTM

what kind of taps ? mixer taps?
yes mixer taps on bath /basin and kitchen sink . bath and basin are good 35yrs old
Post automatically merged:

yes mixer taps on bath /basin and kitchen sink . bath and basin are good 35yrs old
 
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ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
yes mixer taps on bath /basin and kitchen sink . bath and basin are good 35yrs old
Post automatically merged:

yes mixer taps on bath /basin and kitchen sink . bath and basin are good 35yrs old
do they have iso valves on the cold ? as they cold could be mixing / forcing its way in
 
OP
K

KTM

do they have iso valves on the cold ? as they cold could be mixing / forcing its way in
no isolation valves good point did think we may-be pulling cold through just concerned on size of boiler fitted in kitchen /bathroom upstairs that's where the flow is at worst
Post automatically merged:

no isolation valves good point did think we may-be pulling cold through just concerned on size of boiler fitted in kitchen /bathroom upstairs that's where the flow is at worst
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
easy way to tell turn boiler cold water off eg on inlet valve then open a hot tap you shouldn't get anything coming out after 10 seconds

also to confirm too much flow which i dont think the issue is turn the boiler iso down to half open
 
OP
K

KTM

Good thanks I will try this . Do you think the boiler should be bigger than 24kw .
 

ShaunCorbs

Staff member
S. Mod
Plumber
Gas Engineer
Good thanks I will try this . Do you think the boiler should be bigger than 24kw .
tbh depends on load as it’s a flat should be fine at most it’s a shower and the hot taps
 

SimonG

Plumber
Advent Win
Fit an iso on the hot water tap to bath that regulates the flow. Not rocket science as they say.
 

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