Mark Oliver Plumbing & Heating - Expert Oil Boiler Services & Installations

"Had a leaking cold water tank in loft. Mark responded very quickly both in coming out initially but also finding time to replace really quickly. Mark was punctual, professional and left everything spotless. Would highly recommend. Thanks Mark"

"Mark came to service my oil boiler & found a couple of things that were not quite right. I’d been told previously by another engineer that the boiler was not able to be repaired, so to be told he could fix it was a great relief. He went to great lengths to get the correct gasket & came back promptly to fit it & finish the service. His service is second to none, so if you have an oil fired boiler, Mark should be your first call for servicing or repairs."

"Mark has been our go to boiler man for over nine years now. During which time he has annually serviced, fixed and installed a new boiler. Also handled an issue with oil feed and other bits and pieces along the way. At the end of the day he’s reliable and reacts when you have an issue. I’m happy to recommend him."

"Back in January 2026 I discovered I had a leak on the watermain under my drive. Southern water were no help at all so I got advice from a plumber who suggested laying a whole new main and quoted me for the work. However, they would not commit to a start date and all the time I was losing a lot of water. I then looked at Southern Water's list of approved plumbers (WaterSafe Register), picked out local plumber Mark Oliver, and left a message with his AI assistant. Then things started to happen. Mark came back to me straight away and quoted me less than the original plumber. He got on with laying the new main promptly. Unfortunately we had to wait 4 weeks for Southern Water to inspect the trench and further week to connect the supply which was yesterday 27 April 2026. Yes, over 3 months of disrupted water supply and serious loss of water. Until Mark Oliver became involved the situation was causing me a great deal of stress but Mark took control and made things happen. Mark demonstrated empathy for my situation and had a 'can do' no nonsense approach. A good sense of humour too! Would definitely recommend."

"We recently had a new oil boiler installed at our home in Botley and we couldn’t be happier. Mark was professional, punctual, and very tidy, explaining everything clearly during the installation. The boiler works perfectly, and the follow-up service was excellent. Highly recommend for anyone looking for reliable heating solutions! We would use the services of Mark Oliver Plumbing & Heating again in a heartbeat!"