I'm in the middle of converting a 2 bed bungalow into a 5 bed house. Plans are for two baths and 4 showers - my Plumber suggested a 300 litre unvented hot water system and has installed an Ariston product which works quite well with the only operational shower I have just now however - the pressure drops when I run the tap in the same bathroom so I'm worried the system won't be up for four showers in the future.
The Builder carrying out the conversion suggest the problem is down to the flow being restricted by old (1920's) water main and suggested upgrading to modern large dia plastic pipe (cost £500 which sounds reasonable) however I've just noticed he's laying out 20mm blue pipe where I was under the impression most people upgrading water pipes are talking 25 or 28mm. Is the 20mm pipe going to do the job or should I mention this before the pipes installed?
Thanks for any advice - I don't want to pic fault with the builders work but do want this to be an improvement and solve the problem.
The Builder carrying out the conversion suggest the problem is down to the flow being restricted by old (1920's) water main and suggested upgrading to modern large dia plastic pipe (cost £500 which sounds reasonable) however I've just noticed he's laying out 20mm blue pipe where I was under the impression most people upgrading water pipes are talking 25 or 28mm. Is the 20mm pipe going to do the job or should I mention this before the pipes installed?
Thanks for any advice - I don't want to pic fault with the builders work but do want this to be an improvement and solve the problem.