Plumbing Questions? Ask a Plumber for Answers ASAP
Is the 15mm pipe to the house connected to the cold mains supply, or a gravity-fed supply?
Sorry for all the questions - I should also have asked you the distance from the house to the outbuildings.
I would first of all change the supply to be 15mm copper or Hep2o. Is it currently in copper? How many twists and turns are there? And what type of isolating valve have you used at each/either end?
Apologies -I meant from 15mm copper to be 22mm.
One moment - I'm typing you an answer...
The bore of plastic pipe is significantly narrow than copper.Was the pipe ducted, or could it have been crushed at all?Do you know your mains cold flow rate at the house end?What type of stop valve is at the house end?Turning to your original question, there are three ways of boosting the supply (in addition to increasing the bore size).1. A break tank in the outbuildings with a pump on the outlet;2. A pump on the supply to the outbuildings, but you would need permission from your water company if you want a flow rate of greater than 12 litres/minute.3. An accumulator.
You can easily measure the flow rate with a bucket and a wristwatch.If you do that at the house and then in the outbuildings, then we'll have numbers to work with. Without them this is guesswork.
You're welcome - just post again here when you're ready and I'll pick it up.