Thanks for setting up photos, Andy.
Firstly this "heavy rain" noise you hear when the heating is on. Is this coming from the boiler and does it coincide with the burner operating (flames on)? Dose it get worse as boiler flow temperature rises?
I don't think you ever said which condensing boiler was fitted. Some can make strange noises if not set up carefully (burner pressures, etc.), so if you can identify boiler it will help. Did the installers leave you with the "benchmark" record (a kind of log book - A5 blue)?
Also did the installers flush the system properly (judging by black sludge sprayed on ceiling when air pressure testing new system, I would have thought not)? Sludge could get into boiler heat exchanger and cause noise.
As for condensate/discharge pipes outside, the upper copper one should not discharge into drain. It could be cut off quite close to door frame and turned (with bend) towards wall. The condensate pipe should really be insulated against freezing, and/or increased to 32mm size externally. Either way it then becomes more conspicuous.
Firstly this "heavy rain" noise you hear when the heating is on. Is this coming from the boiler and does it coincide with the burner operating (flames on)? Dose it get worse as boiler flow temperature rises?
I don't think you ever said which condensing boiler was fitted. Some can make strange noises if not set up carefully (burner pressures, etc.), so if you can identify boiler it will help. Did the installers leave you with the "benchmark" record (a kind of log book - A5 blue)?
Also did the installers flush the system properly (judging by black sludge sprayed on ceiling when air pressure testing new system, I would have thought not)? Sludge could get into boiler heat exchanger and cause noise.
As for condensate/discharge pipes outside, the upper copper one should not discharge into drain. It could be cut off quite close to door frame and turned (with bend) towards wall. The condensate pipe should really be insulated against freezing, and/or increased to 32mm size externally. Either way it then becomes more conspicuous.