Hi,
I'm getting quite a big loss in flow rate upstairs compared to downstairs. Here are the details:
I'm not getting a great litre per minute of hot water from my combi, I'm getting around 12 lpm (which outputs 18 lpm at maximum). When I looked into it, I'm only getting about 12 lpm of cold water into the boiler from the mains, so the boiler seems to be working as it should.
BUT, I get 40 litres per minute of cold water at the property boundary (according to Yorkshire Water). At the first tap (an outside tap), I get about 20 lpm which I'm happy with. I recently had new alkathene pipe laid from the boundary to the house so there can't be any problems there, hopefully.
A little further along the plumbing, still downstairs, I tested the flow into my washing machine and it is also about 20 lpm. However, the pipes (all 15mm plastic push-fit) then go behind the plaster and up the wall to the next floor. I exposed some pipes and tested the flow rate on upstairs, directly from the 15mm pipe, and I am only getting 15lpm. My questions are as follows:
1. Does it sound normal that I am losing 5lpm from downstairs to upstairs?
2. I also don't understand why I'm losing a further 3lpm by the time the cold main reaches the boiler (boiler input is 12lpm) which is only about 5 metres from the pipes giving 15lpm, and on the same floor.
Thanks in advance.
Andy
I'm getting quite a big loss in flow rate upstairs compared to downstairs. Here are the details:
I'm not getting a great litre per minute of hot water from my combi, I'm getting around 12 lpm (which outputs 18 lpm at maximum). When I looked into it, I'm only getting about 12 lpm of cold water into the boiler from the mains, so the boiler seems to be working as it should.
BUT, I get 40 litres per minute of cold water at the property boundary (according to Yorkshire Water). At the first tap (an outside tap), I get about 20 lpm which I'm happy with. I recently had new alkathene pipe laid from the boundary to the house so there can't be any problems there, hopefully.
A little further along the plumbing, still downstairs, I tested the flow into my washing machine and it is also about 20 lpm. However, the pipes (all 15mm plastic push-fit) then go behind the plaster and up the wall to the next floor. I exposed some pipes and tested the flow rate on upstairs, directly from the 15mm pipe, and I am only getting 15lpm. My questions are as follows:
1. Does it sound normal that I am losing 5lpm from downstairs to upstairs?
2. I also don't understand why I'm losing a further 3lpm by the time the cold main reaches the boiler (boiler input is 12lpm) which is only about 5 metres from the pipes giving 15lpm, and on the same floor.
Thanks in advance.
Andy