We are a small family run business employing 5 staff. Our heating Engineers are skilled, experienced and fully qualified in all aspects of gas heating and plumbing. KTH Services Ltd (K Terry Heating) has been installing boilers in and around Hertfordshire since 1985. With over 4,000 boilers installed; we have built up a large and loyal customer base.  We install, service and maintain gas boilers.  We also carry out the installations of radiators, thermostatic valves, hot water cylinders, nest & hive systems.  We offer free quotations on all boiler installations.

Why choose K T H Services Limited

  • We are a local family run business that have worked in and around Hertfordshire for over 30 years.
  • We pride ourself on our customer service, reliability and punctuality. 
  • We offer 7 to 10 year guarantee's on all our new boiler installations in partnership with Worcester Bosch.


Gas safe


  • Cylinders
  • Gas boiler

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These fully training independent installers specialise in Worcester Bosch installations and can offer exclusive benefits to homeowners, including extended guarantees and certified knowledge of Worcester Bosch products. They can provide you with crucial advice and free, no-obligation quotes.