B
borka
Hello
I am trying to replace my current gas boiler (Potterton) with a combi one (Worcester). Boiler is located in the middle of the flat on the upper floor. Two companies specializing in Worcester had a look and they both suggested to make a strictly vertical flue and for that they would need to make a new hole in a roof. I do not expect freeholder to be very excited about that, so I have done some research to see if current flue setup can be used. Current flue is about 7 meters long and it is 6cm in diameter and have 5 bends. According to Worcester manuals that would exceed maximum flue length. However, if I look at 8cm diameter flue, then maximum limit is much longer. For example for Greenstar 29CDi it is 18meters. Also it is possible to reduce the number of bends down to 3. So simple math indicates that by using flue 8cm in diameter, 7 meters long and 3 bends (add 2 meters each) I would get an equivalent of 13 meters flue, which would not exceed maximum length and would eliminate need for creating any new holes. So the questions are:
Is my conclusion valid or am I missing something?
I am trying to replace my current gas boiler (Potterton) with a combi one (Worcester). Boiler is located in the middle of the flat on the upper floor. Two companies specializing in Worcester had a look and they both suggested to make a strictly vertical flue and for that they would need to make a new hole in a roof. I do not expect freeholder to be very excited about that, so I have done some research to see if current flue setup can be used. Current flue is about 7 meters long and it is 6cm in diameter and have 5 bends. According to Worcester manuals that would exceed maximum flue length. However, if I look at 8cm diameter flue, then maximum limit is much longer. For example for Greenstar 29CDi it is 18meters. Also it is possible to reduce the number of bends down to 3. So simple math indicates that by using flue 8cm in diameter, 7 meters long and 3 bends (add 2 meters each) I would get an equivalent of 13 meters flue, which would not exceed maximum length and would eliminate need for creating any new holes. So the questions are:
Is my conclusion valid or am I missing something?
