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Why Choose Us?

Gas Safe-registered engineers

Every member of our team is Gas Safe-registered, fully insured and highly experienced in combi, system and regular boilers. We follow all current regulations (G3, Part L, etc.) and handle the entire installation from start to finish.

Honest, transparent pricing

We provide a free site survey and a fully itemised quote before any work begins. No hidden fees—ever. Whether you need a new condensing boiler or want to upgrade your older system, we’ll work within your budget.

All makes & models

We install all major boiler brands (Worcester Bosch, Vaillant, Ideal, Baxi and more). If you already have a preferred model, simply let us know; otherwise, we’ll recommend the right boiler for your home’s size and hot-water requirements.

Fully guaranteed work

All installations come with a minimum 2-year manufacturer warranty (and extended options are available). We’ll register your new boiler with the manufacturer on your behalf for hassle-free cover.

Our Services

New Boiler Installations

Combi, system or conventional boilers supplied and fitted. Ideal for first-time installations or replacing an old, inefficient unit.

Boiler Replacements & Upgrades

Looking to improve efficiency? We’ll remove your old boiler, fit a modern A-rated condensing boiler and balance your radiators for even heat distribution.

Central Heating System Design

From radiators and pumps to cylinders and flues, we’ll design (or redesign) your entire heating system for maximum performance.

Boiler Service & Maintenance

Annual servicing to keep your warranty valid and your boiler running at peak efficiency. We also carry out fault-finding, repairs and cold-start diagnostics.

Powerflushing & System Cleansing

Remove sludge and debris from your radiators and pipework, prolonging the life of your boiler and improving heat output.

Definitive Boilers – Expert Boiler Installations Across Nottinghamshire & Derbyshire

Looking for a reliable, fully qualified team to install, replace or service your boiler? At Definitive Boilers, we deliver professional, affordable boiler installations to homeowners across Nottingham, Chesterfield, Alfreton, Derby and Mansfield. With over 10 years’ experience in heating systems and gas work, you can trust our friendly engineers to get your new boiler up and running safely, quickly and at a competitive price.

What Our Customers Say

“Definitive Boilers fitted our new Worcester Bosch combi last month. From the quote to the final handover, everything was explained clearly and the work was spot-on. Highly recommended!”

Sarah H., Nottingham

“Fantastic service from start to finish. They replaced our old boiler in Chesterfield quickly, left the house spotless and even registered the new warranty for us. Great value too!”

Mark T., Chesterfield

Boiler Installations in Nottingham, Derby & Surrounds