A neighbour/friend is to renovate his flat. We live in an old block of flats. The flats have chimney breasts in each room, inc kitchen, which almost everyone have blocked up or made cupboard space out of them. The chimneys are internal, not being on external walls.
Now, he is considering opening his kitchen breast, making a large cupboard out of it and fitting a combi boiler inside running the exhaust pipe up the flue making the it room sealed. The roof is flat so easy access the for the flue terminal. The exhaust flue pipe will be about 20 foot in length. The breast is about 20 feet from an outside wall. There are two problems which one is easy to overcome.
1) The condensate drain can have a condensate pump and pumped under the floorboards (2"gap) in a plastic pipe to a HepVo trap near a drain near the outside wall. Or fit a non-condensing Vokera SE, which will be exempt. This is not a real issue. If a condensing boiler is chosen he is considering an Intergas, which is highly thought of, with the outside sensor wire run up the flue to be screwed to the side of the chimney stack on the roof.
2) The pressure relief pipe. The question: Can the pipe on the combi be teeded into a CH return pipe, then another pressure relief valve teed into the CH pipe that runs near the outside wall, 20 foot away and run through the wall fitting one of the neat terminating buttons? I see no reason that it cannot be done. The boiler valve if it opens discharges into the CH pipe, so any pressure in the boiler is got away immediately, which 20 foot away has another pressure relief valve which opens up to the atmosphere. Both valves would be 3 bar opening pressure.
This forum's software is so slooooow.
Thanks for any "sensible" replies.
Now, he is considering opening his kitchen breast, making a large cupboard out of it and fitting a combi boiler inside running the exhaust pipe up the flue making the it room sealed. The roof is flat so easy access the for the flue terminal. The exhaust flue pipe will be about 20 foot in length. The breast is about 20 feet from an outside wall. There are two problems which one is easy to overcome.
1) The condensate drain can have a condensate pump and pumped under the floorboards (2"gap) in a plastic pipe to a HepVo trap near a drain near the outside wall. Or fit a non-condensing Vokera SE, which will be exempt. This is not a real issue. If a condensing boiler is chosen he is considering an Intergas, which is highly thought of, with the outside sensor wire run up the flue to be screwed to the side of the chimney stack on the roof.
2) The pressure relief pipe. The question: Can the pipe on the combi be teeded into a CH return pipe, then another pressure relief valve teed into the CH pipe that runs near the outside wall, 20 foot away and run through the wall fitting one of the neat terminating buttons? I see no reason that it cannot be done. The boiler valve if it opens discharges into the CH pipe, so any pressure in the boiler is got away immediately, which 20 foot away has another pressure relief valve which opens up to the atmosphere. Both valves would be 3 bar opening pressure.
This forum's software is so slooooow.
Thanks for any "sensible" replies.