New Boiler Installation London
New Boiler Installation London Help Centre
How new boiler installation works, what affects price, and how to book a survey.
We install new boilers across London with Gas Safe registered engineers.
Free survey and clear quotes based on your property and heating needs.
24/7 availability with London wide call handling and booking.
New Boiler Installation London (Gas Safe)
Need a replacement boiler or upgrading an older system? Tell us your postcode, property type, and whether you want combi or system and we will advise the right next step.
📞 Call 0203 695 3137
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Fast triage: postcode, number of bathrooms, current boiler type (combi or cylinder), and any current fault codes.
⚠️ Safety First
Boiler in lockout? If you smell gas, leave the property and call 0800 111 999. If there is no gas smell, note the fault code and call us for advice on whether repair is sensible first.
Choosing the wrong boiler: Oversizing wastes money and reduces efficiency. We size the boiler to your property properly.
System condition: If your radiators are cold at the bottom or the system is noisy, a clean may be needed to protect the new boiler.
Jump to: When to Replace · Combi vs System · What Affects Price · Installation Process · FAQs
When a New Boiler Makes Sense
- Boiler is 10 to 15 years old and needs a major repair (PCB, fan, heat exchanger)
- Repeated breakdowns and rising repair costs
- Poor efficiency and high bills
- Parts hard to source for older models
- Upgrade needed for better hot water and heating control
Not sure? Use our honest guide: repair or replace.
Combi vs System Boiler
Combi boiler: heats water on demand, no hot water cylinder, great for many flats and smaller homes.
System boiler: works with a hot water cylinder, better for higher hot water demand and multiple bathrooms.
If you already have a Megaflo or other cylinder, a system boiler may be the best match.
What Affects the Installation Price
- Boiler type and output: combi vs system, kW sizing
- Flue position and access: standard horizontal vs vertical flue
- Controls: smart thermostat, programmer upgrades
- System clean: whether a power flush is needed
- Pipework changes: old pipework upgrades or relocation
- Condensate route: internal route and freezing prevention
If your system is dirty, a power flush may be recommended to protect the new boiler.
How New Boiler Installation Works
- Quick assessment: we ask your postcode, property type, bathrooms, and current setup.
- Survey: we confirm sizing, flue route, gas pipe sizing, and system condition.
- Quote: clear written quote based on the survey.
- Installation: remove old boiler, fit new unit, controls and safety checks.
- Commissioning: full testing, benchmark, and handover guidance.
Popular Boiler Options We Install
🔧 Repair or Replace Decision?
If your current boiler is in lockout and you need a fast decision, call us with the fault code and the age of the boiler. We will advise whether repair is sensible or whether replacement is more cost effective. If radiators are cold at the bottom, a power flush can protect your new boiler. Power flush guide.
New Boiler Installation FAQs
How quickly can you install a new boiler?
It depends on the boiler type and whether pipework changes are required. We can give a realistic timeline after the survey.
Do you remove the old boiler?
Yes, removal and safe disposal are included as part of a standard installation.
Do I need a power flush for a new boiler?
If the system has sludge, a clean is often recommended. It helps protect the new boiler and improve heating performance.
Can I keep my cylinder?
Often yes. If you have a Megaflo or similar, we can advise the best boiler match during the survey.
Related Services
Book a Boiler Survey
Speak to our team and we will arrange the right next step for a clear quote and safe installation.
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