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The microbore is 8mm and has been in use for 27 years. I only hought the house a few months ago so I'm not really sure how well the system works, although it seemed generally warm enough in the house. Im in a very hard water area so I am concerned about rads and pipes getting sludged and...

Hope someone can advise whether I need to replace my microbore pipes as i am getting different opinions, and costs from builders. I have a house with the main runs in 22mm pipe and the tails to the rads in microbore. I plan to build an extension which would have normal pipe sizes in it...