Does a boiler have to be on an outside wall

Starting to think about doing a kitchen remodel and would like to move our boiler out of the kitchen. Does it have to be installed on an outside wall? What are our options?

Asked by Jenny on 24th Dec 2025
Expert Trade Answers
"Preferably, but not compulsory.

Some boiler flues can be installed through roofs."
Answered on 24th Dec 2025 - Member since May 2017 - report
"Not necessarily but to keep costs to a minimum the location off an outside wall is always the best location. The flue can go directly out and also the condensation water . The boiler also needs a pressure relief pipe to go outside"
Answered on 24th Dec 2025 - Member since Feb 2025 - report
"Can go on any wall - a lot are in cupboards upstairs just needs the flue to go through the ceiling into attic space and out the roof

Just costly to move the boiler and worth doing if wanted with a boiler replacement"
Answered on 24th Dec 2025 - Member since Jun 2024 - report
"No can use a vertical flue kit and exit out of a roof"
Answered on 24th Dec 2025 - Member since Nov 2018 - report
"No it doesn’t, as long as it is secure, you can buy flue extensions, but they are limited by the boilers KW rating"
Answered on 24th Dec 2025 - Member since May 2025 - report
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