I have today had a plumber`s quote for removing my dead Baxi Back Boiler with its associated front fire (one of the old ones that stick right out the wall), in order for him to then plumb upwards from the front lounge which faces the street (and where the gas meter is, ie boxed off in the lounge, & the only point of gas in my end terraced house), through my bedroom above, and finishing up in the loft, where he will install a Worcs-Bosh HE 28W Combi, and flue it out of the outside terraced wall. He tells me because its a Condensing Combi, this will also necessitate a pipe going along the side of the end terrace wall, down into my back yard, where it will terminate into a grid there.. Not entirely sure if that is usual, but he mentioned something about the need to take the water away somewhere, hence the pipe running along the side of the house, etc.. Can anyone explain further why this is needed? I have been quoted approx £2.5k for all this work, taking over 2-3 days , he tells me- is this a fair quote, too?
TIA