A system boiler heats your central heating system directly and produces hot water for your cylinder. We have the technology to survey drains for both private (from 100mm in diameter) and commercial (up to 1 metre in diameter) drains. If you are experiencing a plumbing emergency or need plumbing repairs or installations made on a weekend, please contact us at. Anyone who tries to install a boiler without the relevant qualifications may be putting their home and. Engineers.