Is made of high grade stainless steel and has a fire tube design for excellent heat transfer capabilities it provides a low pressure drop for maximum efficiency. What are ways to avoid plumbing scams? As always, you can rest assured that you are hiring a plumber you can trust, backed by water safe national accreditation, with specific training in the uks water fittings regulations and byelaws. If the business you're looking for isn't here, add it! Impact data and claims within this report.