How much does it cost to service a tankless water heater?

We've got an unvented water heater that hasn't been serviced since it was installed three years ago. How much should a service cost?

Asked by Christian on 1st Jun 2026
Expert Trade Answers
"£80 to £100 depending on the type plus any replacement parts if needed."
Answered on 28th Jun 2026 - Member since Mar 2025 - report
"Anything between £90.00 to £110.00. This is as long as no parts are required."
Answered on 3rd Jun 2026 - Member since Jul 2019 - report
"between hundred and hundred and fifty, as tests have to be done to the pressurized safety device pressurizing of the expansion vessel and inspection of the tank itself"
Answered on 4th Aug 2026 - Member since May 2019 - report
"Call out fee plus parts if anything needs to be replaced"
Answered on 1st Jun 2026 - Member since Oct 2023 - report
"Depending on plumber but it take about 1 hour so I normally do a standard hourly rate of £38 plus vat"
Answered on 1st Jun 2026 - Member since May 2026 - report
"Roughly around £80 - £200 depends on the plumber as a lot charge different rates and sometimes will charger extra depending on location too."
Answered on 1st Jun 2026 - Member since May 2026 - report
"I'd be on £95 for this plus any parts.if required."
Answered on 6th Jun 2026 - Member since Jun 2026 - report
"We always work off £80 per hour plus VAT for Boiler services and four unvented cylinders to be inspected and recharged"
Answered on 1st Jun 2026 - Member since May 2018 - report
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