Hi All.
Apologies, I replied to an old post earlier but decided that it may be better to add a new thread. I had a firm give me a quote, stating that I could have a new combi without having to change the pipework, saving me about £500 on the bill. They have come on recommendation and I dont think for one minute that they arent up to the job or would start a job without being prepared to make sure that it is right.
The problem is this. They have fitted a Potterton Apollo 30KW. When it pumps the water around the system, the radiators do not get fully hot. The plumber believes that the pump in the combi (much more powerful than the pump which was connected inline to the 22mm pipe from the Baxi back boiler) is firing the water around the circuit at such a speed that the radiators are only getting hot-ish. He explained that the water at speed will travel the path of least resistance and in effect the water is merely travelling around the circuit without really having the opportnity to enter the parallel branches at the rads.
The combi is showing that the water is getting up to 80ish degrees and the 22mm pipe is extremely hot to the touch.
The plumber will be coming back at the weekend to remove a section of the pipe at the bottom of each rad, blanking each end and therefore forcing the water through each rad in turn. The system will become serial which I understand is not the best. I'm not unduly concerned about this as I can have the room stats removed and have a system which more or less works?
Albeit this will not be ideal. To give me breathing space prior to re-piping the house, does all of this seem plausible? As a DIY'er I feel satisfied that this is the issue. Your expert views would be very much appreciated.
Thanks, John.
Read more: //www.diynot.com/forums/viewtopic.php?t=209430#ixzz2NFAdUBwx
Apologies, I replied to an old post earlier but decided that it may be better to add a new thread. I had a firm give me a quote, stating that I could have a new combi without having to change the pipework, saving me about £500 on the bill. They have come on recommendation and I dont think for one minute that they arent up to the job or would start a job without being prepared to make sure that it is right.
The problem is this. They have fitted a Potterton Apollo 30KW. When it pumps the water around the system, the radiators do not get fully hot. The plumber believes that the pump in the combi (much more powerful than the pump which was connected inline to the 22mm pipe from the Baxi back boiler) is firing the water around the circuit at such a speed that the radiators are only getting hot-ish. He explained that the water at speed will travel the path of least resistance and in effect the water is merely travelling around the circuit without really having the opportnity to enter the parallel branches at the rads.
The combi is showing that the water is getting up to 80ish degrees and the 22mm pipe is extremely hot to the touch.
The plumber will be coming back at the weekend to remove a section of the pipe at the bottom of each rad, blanking each end and therefore forcing the water through each rad in turn. The system will become serial which I understand is not the best. I'm not unduly concerned about this as I can have the room stats removed and have a system which more or less works?
Albeit this will not be ideal. To give me breathing space prior to re-piping the house, does all of this seem plausible? As a DIY'er I feel satisfied that this is the issue. Your expert views would be very much appreciated.
Thanks, John.
Read more: //www.diynot.com/forums/viewtopic.php?t=209430#ixzz2NFAdUBwx