Boiler Installation

We install a wide range of energy efficient boilers. Click to see more.

Boiler Repair & Servicing

We service & repair all major boilers brands. Click to see more.

Power Flushing

Powerflushing improves the performance of your radiators. Click to see more.

Oil Tank Installation

We install a wide range of oil tanks. Click to see more.
  • We've used Cosmo's for years and we have always been very happy with the service. David's a very nice guy to deal with and always does great job. Will certainly recommend him.
    Sarah Whiteside
  • We recently moved into our new house and wanted to get the boiler up and running before the colder months. David was really efficient and friendly and well priced, given that the previous owner's lack of care for their boiler was likely a more time consuming service than normal. 5 Star service¬†🙂
    Vicky Hegan
  • David is a professional, friendly and honest guy, with all of his work carried out to the highest standard and very reasonably priced. Would recommend to everyone. 5 stars all round.
    Sarah Howard
  • Fantastic service. I called David on a Saturday morning regarding my boiler not working. He called round a few hours later, fitted a new oil pump, jet and had it all working again within no time. Highly recommended.
    Doug Pearson
  • Booked Cosmos to service my boiler on 19/01/2016. David arrived spot on time and no Faffing about, straight into the job. He did an excellent job and gave me some very good advice on looking after the heating system. I can recommend Cosmos to any one needing their boiler serviced