Hi Folks,
I have a Worcester 40CDi boiler installed about 8 years ago (new when I bought the house) along with a Megaflow hot water tank - not sure of age, maybe 15 years old? Tank is one of the all in one pre-insulated, plastic coated types.
I know the system pretty well as the boiler was fitted by a Worcester accredited muppet who couldn’t get it fully working and then left the job and didn’t come back. As such, I replaced and rewired pretty much all of the electrics 8 years back, as hardly any of the old parts still worked.
For the past week or so, the hot water from the tank hasn’t been particularly hot. It’s warm, but not hot.
I ran the hot water cycle on the Hive timer for 5 hours this morning and still no “hot” water.
The 2 port valve opens and closes fine, when it should. The pump runs fine and also runs the CH, which works fine. The boiler turns on as it should, and reads about 72c.
The cylinder stat (set on about 62c) seems to work fine. After 5 hours of running, valve is still open and pump is running. I have to turn the stat down to about 40c before that all turns off.
I felt a slight drip from the PRV outlet from the tank last week so I drained and reprimed the tank, per the instructions on it, suspecting the air gap might have been lost. No signs of dampness around the PRV outlet today but water is still not particularly hot.
Flow pipe to the tank measures about 60c and the return about 32c. This is after 5 hours of running… I’d expect the return to be a lot hotter after that time.
Tank insulation seems fine. Tank is cold to the touch and it stays hot when water is heated with the immersion.
Any ideas on what this might be? Perhaps dirt build up in the tank’s heat coil? I don’t have a power flusher but could maybe try a mains flush as it’s only a few feet from the filling loop.
Any advice would be appreciated.
Thanks
Phil
I have a Worcester 40CDi boiler installed about 8 years ago (new when I bought the house) along with a Megaflow hot water tank - not sure of age, maybe 15 years old? Tank is one of the all in one pre-insulated, plastic coated types.
I know the system pretty well as the boiler was fitted by a Worcester accredited muppet who couldn’t get it fully working and then left the job and didn’t come back. As such, I replaced and rewired pretty much all of the electrics 8 years back, as hardly any of the old parts still worked.
For the past week or so, the hot water from the tank hasn’t been particularly hot. It’s warm, but not hot.
I ran the hot water cycle on the Hive timer for 5 hours this morning and still no “hot” water.
The 2 port valve opens and closes fine, when it should. The pump runs fine and also runs the CH, which works fine. The boiler turns on as it should, and reads about 72c.
The cylinder stat (set on about 62c) seems to work fine. After 5 hours of running, valve is still open and pump is running. I have to turn the stat down to about 40c before that all turns off.
I felt a slight drip from the PRV outlet from the tank last week so I drained and reprimed the tank, per the instructions on it, suspecting the air gap might have been lost. No signs of dampness around the PRV outlet today but water is still not particularly hot.
Flow pipe to the tank measures about 60c and the return about 32c. This is after 5 hours of running… I’d expect the return to be a lot hotter after that time.
Tank insulation seems fine. Tank is cold to the touch and it stays hot when water is heated with the immersion.
Any ideas on what this might be? Perhaps dirt build up in the tank’s heat coil? I don’t have a power flusher but could maybe try a mains flush as it’s only a few feet from the filling loop.
Any advice would be appreciated.
Thanks
Phil