Summary - The gas seems to come on full to heat hot water, gets to a temperature then turns fully off, restarting moments later when (obviously) the water has dropped in temperature. Hence the hot water in the pipe goes up and down temperature like a yoyo. Water temp is very hot (>65 degs) when at peak of cycle. Gas flow or water temp doesn't seem to be regulated by water temp switch on front of boiler (i.e. water temp not kept constant by gas flow adjusting)
Details - I have a Worcester 28 CDi combination boiler (suspect around 7-8 years old, we've only been in the property 4 years) in a 4 bed house with one bathroom. Direct cold water mains feed to the boiler. We didn't really notice the problem with the hot water until the shower got upgraded although it was there on every tap (just thought thats how the bolier works, on/off to regulate the temp) if you just ran it hot. Shower works great and pipework is fine for it (i.e. we considered the right shower head for likely flow, etc), but the problem with heating (of water going binary on/off) is a lot more obvious now and you can hear the pipes expanding/contracting the whole time the shower is running.
So for my questions, if anyone can please help
- Are boilers meant to work like this or should they adjust flame to keep water at constant temp?
- If not what is likely to be wrong?
- Is it just time to get a better boiler with a bit more "poke"?
Note - Boiler was "serviced" by BritGas 2 weeks ago who gave clean bill of health despite my wife pointing out this problem (and occasional drip of water from underneath) - yes I know they only check to see if gas is pouring out the side of it and don't fix anything else (strange if I take my car for a "service" they identify all faults and offer to fix)
Details - I have a Worcester 28 CDi combination boiler (suspect around 7-8 years old, we've only been in the property 4 years) in a 4 bed house with one bathroom. Direct cold water mains feed to the boiler. We didn't really notice the problem with the hot water until the shower got upgraded although it was there on every tap (just thought thats how the bolier works, on/off to regulate the temp) if you just ran it hot. Shower works great and pipework is fine for it (i.e. we considered the right shower head for likely flow, etc), but the problem with heating (of water going binary on/off) is a lot more obvious now and you can hear the pipes expanding/contracting the whole time the shower is running.
So for my questions, if anyone can please help
- Are boilers meant to work like this or should they adjust flame to keep water at constant temp?
- If not what is likely to be wrong?
- Is it just time to get a better boiler with a bit more "poke"?
Note - Boiler was "serviced" by BritGas 2 weeks ago who gave clean bill of health despite my wife pointing out this problem (and occasional drip of water from underneath) - yes I know they only check to see if gas is pouring out the side of it and don't fix anything else (strange if I take my car for a "service" they identify all faults and offer to fix)