Finding Solutions for your Gas & Heating needs couldn't be easier with National Plumbing and Heating; The Gas Installation & Repair Engineers You Can Rely On. National Plumbing and Heating are a team of dedicated gas engineers in Warrington. Most of our engineers are ex-British Gas engineers with 15-30 years experience. Our main aim is to get you up and running as quickly as possible sometimes as quickly as within 2 hours.