Boilers 6 min read24 March 2026
Rutherglen, Cambuslang and much of Glasgow's Southside are dominated by tenement flats, and fitting a combi in one is a different job from a semi-detached swap. These are the five things that decide whether the installation goes smoothly.
The five tenement variables
Get these right at survey and the installation is straightforward. Miss one and you find out on the day, usually expensively.
- Flue terminal position on a shared or gable elevation
- Factor permission for any external work
- Condensate routed to an internal waste so it cannot freeze
- Gas supply upgraded from 15mm where the meter run is undersized
- Removal of the old cylinder and header tank, reclaiming cupboard space
Why the flush matters more in older flats
Rutherglen and Glasgow tenement pipework has often run on gravity circulation for decades with no inhibitor. Dropping a new combi onto that system without a power flush is the fastest way to void the warranty. Every installation we do in G73 and Glasgow includes a flush, a magnetic filter and inhibitor.
Timescales and paperwork
A tenement combi conversion with a cylinder removal is usually one to two days. You receive Gas Safe notification, Building Standards paperwork, manufacturer warranty registration in your name, and a demonstration of the controls before we leave.
Need help with this?
We handle this work every week. See Heating & Boiler Services in Glasgow or browse all our services.
Frequently asked questions
Do I need factor permission for a boiler flue in Rutherglen?
Often yes for external work on a shared elevation. We identify what is needed at survey and handle the application as part of the G73 job.
Where does the condensate go in a tenement flat?
To an internal waste wherever possible, so it cannot freeze during a Lanarkshire winter and lock the boiler out.
Can you remove the old cylinder and tank?
Yes, and most customers reclaim the airing cupboard as storage afterwards.
Related reading
Combi vs System Boiler: Which Suits Your Home
Power Flushing: When You Actually Need One
Emergency Plumber Glasgow: What To Do In The First 10 Minutes