Check our faqs for a range of queries. Our aim is to ensure all our customers have the most cost-efficient boilers and that their home's heating & hot water system is functionally sound. Keston heating, po box 103, national avenue, kingston upon hull, hu5 4jn, united kingdom. If you are experiencing a plumbing emergency, or if you are just looking for a 24 hour plumbing service, give us a call! While electric boilers come with quite a few benefits,.