We have a top floor flat in an old building consisting of 5 flats in total, situated on a hill. Currently, we have a 15mm copper pipe water supply leading up to our kitchen and I have measured 14l/min flow from the kitchen sink and ~3bar static pressure and ~2.5bar working pressure when opening all other taps in the flat.
We would optimally want to increase our water flow to at least 20l/min or more so we can fit a proper unvented system or storage combi (have been looking at Viessmann 222-F). Presuming that the piping to the house is bad I have been looking at two options:
1. Convince the whole freehold to upgrade the main pipe from street to house to say 63mm and exchange the 15mm internal piping for 35mm leading up to the flat.
2. Add a new main of say 35mm to just our flat to separate the connection to the rest of the house.
Option 1 seems more logical and price-effective (if the rest of freehold agrees) however one of the plumbers mentioned that a shared main may not help even if the pipe is wider if you are the top flat in the building as the users below you can use up the water before it gets to our flat.
What would you recommend?
We would optimally want to increase our water flow to at least 20l/min or more so we can fit a proper unvented system or storage combi (have been looking at Viessmann 222-F). Presuming that the piping to the house is bad I have been looking at two options:
1. Convince the whole freehold to upgrade the main pipe from street to house to say 63mm and exchange the 15mm internal piping for 35mm leading up to the flat.
2. Add a new main of say 35mm to just our flat to separate the connection to the rest of the house.
Option 1 seems more logical and price-effective (if the rest of freehold agrees) however one of the plumbers mentioned that a shared main may not help even if the pipe is wider if you are the top flat in the building as the users below you can use up the water before it gets to our flat.
What would you recommend?
