We had our old gas boiler replaced which heated the swimming pool perfectly at 1 deg an hour. We now have a Worcester Bosch 30 cdi 106,000 btu which will not heat up the pool. It heats up pool 1 deg an hour from 10am to 3pm then just stops and will not heat it up any more. Can anyone tell me why? Is there a thermostat somewhere or is gas pressure lowered after 3pm - no one has been able to figure this out.
gas pressure drop
- Thread starter maureenander
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Have you got a timer or is it on constant?
It is on constant - we have tried it on the timer to come on at 9am and go off at 7pm but that doesnt make any difference it still stops heating the pool after 3 pm
This will be the simplest of all problems!
What kind of numbskulls comprise your "no one"?
Have any of them looked at your pool circulating pump as this may be timed and if there is no flow through the pool exchanger there will be no heating!
Tony Glazier
What kind of numbskulls comprise your "no one"?
Have any of them looked at your pool circulating pump as this may be timed and if there is no flow through the pool exchanger there will be no heating!
Tony Glazier
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Quite!
This won't be rocket science, but needs someone who's familiar with boilers and swimming pools, not just an "odd job man".
Check the setting of the Pool water thermostat!!! 
Check the setting of the Pool water thermostat!!!
Well thats interesting - because when the engineer first installed the boiler he fitted a thermostat and when the pool wouldnt heat up properly he took it off as he thought it was causing a restriction.
We originally had 2 - Glow Worm boilers linked in series a 30 btu and a 50 btu and they heated everything perfectly. We used to have the CH and water on one boiler and in the summer we used the two boilers together to heat the swimming pool and got up to 86 deg easy.
We were told they had to be updated because of new regulations and an Engineer recommended 2 - worcester bosch 30cdi boilers (106,000 btu each). The gas pressure was tested by the Gas Company and they said we had low gas pressure and said that our domestic gas meter couldnt cope with 2 boilers of that size so we had one of the boilers disconnected and the swimming pool, water and CH was put on one boiler (106,000 btu which should be sufficient to heat our pool) and we still cant get a decent amount of heat into the swimming pool. We never have all three on at the same time. One of these worcester bosch boilers is twice the size of our old system.
the pool circulating pump hasnt got a timer - it seems to be whirring away all the time it is switched on and there is a steady flow going into the pool. What can go wrong these pumps?
Maureen, you have managed to imply that you have three boilers but elsewhere you say you have two boilers and also that you have just one boiler doing everything.
It does seem that you have had some very incapable people dealing with your systems.
If as you say the problem is because the boiler is only heating for a few hours then it will be a very simple fault.
Any reasonable heating engineer on site will be able to identify the problem.
Pool heating requires that the boiler is working for most of 24/7 for 2-3 days when initially heating pool water and then keeping it topped up for several hours a day if you have an insulating cover or for most of the day if you dont.
Tony
It does seem that you have had some very incapable people dealing with your systems.
If as you say the problem is because the boiler is only heating for a few hours then it will be a very simple fault.
Any reasonable heating engineer on site will be able to identify the problem.
Pool heating requires that the boiler is working for most of 24/7 for 2-3 days when initially heating pool water and then keeping it topped up for several hours a day if you have an insulating cover or for most of the day if you dont.
Tony
Agile";p="2078308 said:
Shouldn't be hard to diagnose...
Either
1) the boiler isn't being called for heat, or
2) it is, but it's turning itself off or down because it's not losing enough heat.
Is the ch temperature knob on maximum?!
What exactly do you mean by "it stops"? The boiler turns off or the temperature stops rising...?
Either
1) the boiler isn't being called for heat, or
2) it is, but it's turning itself off or down because it's not losing enough heat.
Is the ch temperature knob on maximum?!
What exactly do you mean by "it stops"? The boiler turns off or the temperature stops rising...?
The temperature is turned up to maximum. The boiler never switches off but it stops producing heat. Its like it decides that it has produced enough heat and stops producing it - but it is always the same time of day about 3pm. It will not produce heat early in the morning before 10am and will not produce heat after 3pm - is there a clock or internal thermostat within the boiler that decides when it will and wont give out heat. Usually between 10am and 3pm we can get 1 degree an hour but then nothing.
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