Heating, Boilers & Air Conditioning Across South Yorkshire
Total Temperature Control
From emergency boiler repairs and new boiler installations to domestic and commercial air conditioning, Kassgas helps homes and businesses stay comfortable all year round.
Our Gas Safe and F-Gas certified engineers deliver professional heating and cooling services across Sheffield, Doncaster, Rotherham, Barnsley, and beyond.
Our Core Heating & Cooling Services
New Boilers
A+ rated energy-efficient boilers from Worcester Bosch, Vaillant, Ideal & Baxi with long warranties.
Boiler Servicing
Annual safety compliance checks to keep your warranty valid and your system tracking efficiently.
Boiler Repairs
Fast response same/next-day local diagnostics and repairs for no heating or hot water emergencies.
Air Conditioning
F-Gas certified installations, retrofits, and routine servicing for year-round domestic and commercial comfort.
Why Choose Kassgas?
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Local, family-run business trusted across South Yorkshire.
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Gas Safe & F-Gas certified expert engineers.
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Specialists in domestic & commercial temperature control systems.
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Competitive fixed pricing packages with absolute zero hidden costs.
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Consistent 5-star rated service performance across all northern regions.
Additional Expertise
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Commercial Gas: Plant rooms, heavy pipework & safety certificates.
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Power Flushing: Deep chemical flush to remove sludge and boost efficiency.
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Smart Controls: Intelligent Hive, Nest & modern thermostat fitting.
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General Plumbing: From simple leak fixes up to full bathroom refurbishments.
Serving Your Local Area
New Boiler Installation
Our boiler installations can be fitted within 24 hours and all come with a minimum 5 years warranty up to a maximum 12 years. We install 7 days a week to work around your needs and apply no extra cost to weekends.
Boiler Servicing
Boiler Repairs
Power Flush
Landlords / Letting Agents
Plumbing
We can help with any general plumbing work from emergency leaks to outdoor tap installation.
Smart Thermostat
Cooker Installation
Our gas cooker installations comply with all safety regulations. Moving house? We can remove your cooker in one property and install it in another on the same day, including weekends.
Commercial Gas Services
We provide comprehensive Commercial Gas services including installation and maintenance of gas equipment, thorough safety inspections by Gas Safe registered engineers, and energy efficiency solutions to help you save money and reduce your environmental impact.
Our most popular boiler installations
Kassgas Price Match
We beat any like for like boiler quotation.
We will beat any like for like quotation for a boiler
installation as long as it fully complies with all relevant regulations. Simply provide us with a valid quotation for the same service and we will beat it.
Boiler Repair
Our boiler repair service can get your broken boiler back up and running in no time. If your boiler is beyond economical repair, we can offer new boiler installation quotations and will deduct the cost of our visit from your quotation.
Boiler Replacement
We provide installations at some of the lowest prices in Sheffield, Rotherham, Barnsley, Doncaster and other surrounding areas. Call us on 0330 058 9419 or fill in the contact form and one of our Gas Safe Engineers will be in touch, please let us know the best times to contact you on the message section.
Annual Boiler Service
Our boiler servicing comes with a full, industry standard check of your combi boiler or system boiler. We will offer recommendations to prolong the life of your boiler and provide advice on any action that may be needed to keep your boiler running for years to come.
Why Choose Us
We put customer service and satisfaction above all else. Listening to your needs and doing everything in our power to ensure you are fully happy with everything we do. So if you’re looking for a plumber or heating engineer for your next project, why not give us a call.
Our excellent customer service is second to none, check out our reviews here
Reviews
Our Happy Customers!
We rang Kassgas on Wednesday afternoon. By Thursday afternoon we had a new boiler. Billy fitted our boiler, he was extremely polite and tidy he even took his shoes off each time he came into the house. Not enough words to praise him enough, he took time to explain how to work the new boiler and controls to two pensioners.
Billy and Matt were about to leave when we mentioned that our stop tap was leaking, they stayed behind and fit a new one. It was heartwarming to meet two young men who didn’t want to rip us off.
We would and already have spread the word about this company.
Neil & Sue
SueH-976
Billy and Matt just installed a new boiler. They recommended Ideal with a 12 year warranty. They turned up on time within a week of providing a very good quote. they removed the old boiler, installed the new one, flushed the radiators, added inhibitor, installed new halo wireless thermostats and checked everything was working ok in the space of 5 hours. They removed all the rubbish and left a very tidy finish.
I would definitely recommend themWould definitely recommend Kassgas if you have any heating or boiler problems.
Eric Jones
