Warm, reliable heating installed as soon as tomorrow. Southern Energy Group provides fast, safe and affordable boiler installations across Sussex — backed by qualified engineers, strong warranties and guaranteed workmanship.
Free Smart Thermostat Upgrade
(Limited Time Only)
Every new boiler installation includes an EPH thermostat as standard. For a limited time, you can upgrade to a smart thermostat at no extra cost, giving you better heating control, improved comfort, and additional energy savings.
Why Choose Southern Energy Group
- Next-Day Boiler Installation
Next-day availability most days. Ideal for emergency replacements, failed boilers and cold homes. - Lower Energy Bills From Day One
Modern boilers reduce fuel usage and improve heating efficiency, helping you save instantly - Fully Qualified, Gas Safe Registered Engineers
All installations are completed by certified, insured, Gas Safe registered engineers who work to the highest safety and compliance standards. - 12-Month Workmanship Guarantee
Your installation is covered by a full 12-month workmanship guarantee. - Long Warranties (7–18 Years)
Manufacturer-backed warranties ranging from 7 to 18 years, depending on the boiler make and model. - Finance Options Available
Spread the cost with flexible and affordable finance plans. - Finance Options Available
Spread the cost with flexible and affordable finance plans.
Call 07759493013
What’s Included With Your Boiler Installation
- Free Home Heating Assessment
- Professional Installation
- Removal of Your Old Boiler
- Full System Testing & Commissioning
- Thermostat Included
- Up to 18 Years Warranty
- 12-Month Workmanship Guarantee
Need Heating Restored Quickly?
Next-day installation is often available. Ideal for winter breakdowns, emergencies and urgent upgrades
Areas We Cover
We provide plumbing and heating services in:
Frequently Asked Questions
How soon can you install my new boiler?
In many cases we can install your boiler as soon as the next day, subject to availability. Next-day installation is available most of the time.
Are your engineers qualified and Gas Safe registered?
Yes. All engineers are fully qualified, Gas Safe registered, and experienced in installing gas, oil, LPG and electric boilers. All work complies with current UK safety and building regulations.
Are you insured?
Yes. Southern Energy Group is fully insured with public liability and installation insurance, providing total protection for your home throughout the installation process.
How long does installation take?
Most installations take one day, including removal of your old boiler and full commissioning of the new system. System conversions may take 1–2 days.
What types of boilers do you install?
We install gas, oil, LPG and electric boilers from leading manufacturers. We only work with brands that offer reliability, efficiency and strong warranty support.
Will a new boiler reduce my energy bills?
Yes. Modern boilers are significantly more efficient than older systems and can reduce heating bills by 20–35%, depending on your current boiler’s age and condition.
What warranties do you offer?
Depending on the model, warranties range from 7 to 18 years. These warranties are manufacturer-backed and require installation by approved engineers — which we are.
What brands do you work with?
We work with a range of trusted boiler brands known for quality, reliability and long warranties. We recommend the best option for your home during your assessment.
Do you remove my old boiler?
Yes. We handle the safe removal and disposal of your old boiler, ensuring everything is carried out legally and responsibly.
Do you offer finance options?
Yes. Flexible finance plans are available to help spread the cost of your new boiler over manageable monthly payments.
Do you include a thermostat?
Yes. An EPH thermostat is included as standard. You can upgrade to a smart thermostat for free for a limited period.
Do you offer a workmanship guarantee?
Yes. All installations come with a 12-month workmanship guarantee, covering all labour and installation practices.
How do I know which boiler is right for my home?
Our engineer will assess your property and recommend the most suitable boiler based on number of bathrooms, water usage, property size and heating needs. Everything is explained clearly and without pressure.
Is a home survey required?
Yes. A survey ensures we install the right boiler size and confirm flue positioning, safety requirements, heating demand, and pipework condition. This allows us to provide an accurate, fixed quote.
What safety checks are carried out after installation?
Every installation includes gas tightness tests, flue integrity checks, combustion analysis, system pressure checks and verification of all safety devices before handover.
