Business Details
14 Years
experience
Emergency
services
Heating & Plumbing Services in South Yorkshire
Kassgas Ltd is a family-run, Gas Safe registered heating and plumbing specialist serving South Yorkshire since 2012. Our ISO 9001 and ISO 14001 certified team delivers reliable boiler installations, servicing, and repairs for residential and commercial properties across Sheffield, Rotherham, Barnsley, Doncaster, and Chesterfield. With 7-day availability and transparent pricing, we prioritise customer satisfaction through fast response times, DBS-checked engineers, and comprehensive services including air source heat pumps, smart thermostats, and unvented cylinders. Our 5-star rated service combines technical expertise with clear communication, offering 24/7 emergency support and price-match guarantees to ensure long-term client partnerships. 
Services
Boiler Installation
Gas Safety Certificates
Heating Repairs
Smart Thermostats
Power Flushing
Landlord Services
Air Source Heat Pumps
Unvented Cylinders
LPG Services
Plumbing Repairs
Details
- Year established: 2012
Highlights and features
- Family-run business with 10+ years' experience in heating solutions
- ISO 9001 & ISO 14001 certified for quality and environmental standards
- Gas Safe registered engineers with DBS checks for safety assurance
- Transparent pricing with no hidden costs or weekend surcharges
- 24/7 emergency service with 5-star customer satisfaction ratings
Associations and certifications
- ISO 9001
- ISO 14001
- Gas Safe Register
What people say
Polite and tidy engineers
24-hour boiler installation
No hidden costs
Thorough explanations
Emergency repairs
Services
Boiler Installation
We specialise in boiler installations with 24-hour fitting availability. Our Gas Safe engineers install leading brands like Ideal and Worcester Bosch, offering warranties from 5-12 years. All installations include system flushing, inhibitor addition, and wireless thermostat integration. We work 7 days a week with no weekend surcharges.
Gas Safety Certificates
Our CP12 certificates ensure rental properties meet legal gas safety requirements. Engineers inspect all gas appliances annually, providing detailed reports and electronic certificates. We offer monthly payment plans and priority weekend appointments for landlords across South Yorkshire.
Emergency Repairs
Available 24/7 for urgent heating issues, our engineers respond promptly to boiler breakdowns. We follow strict diagnostic checklists to identify faults efficiently, offering transparent repair options before proceeding with any work.
Smart Thermostats
We install advanced smart thermostats including Tado and Salus systems. These devices enable remote temperature control, energy usage monitoring, and automated scheduling. Our installations include full system integration and user training for optimal energy savings.
Power Flushing
Our power flushing service removes sludge and debris from central heating systems using specialist equipment. This restores radiator efficiency and boiler performance, typically completed within a single day visit by our experienced engineers.
People
Billy
Lead Engineer
Experienced Gas Safe engineer with over 8 years in boiler installations. Known for exceptional customer service and attention to detail, Billy ensures every installation meets the highest safety and efficiency standards.
Matt
Senior Technician
Certified heating specialist with expertise in complex system diagnostics. Matt provides reliable repair solutions and clear technical explanations to customers across South Yorkshire's residential and commercial sectors.
Questions
Do you offer emergency boiler repairs?
Yes, we provide 24/7 emergency boiler repair services across South Yorkshire with no extra charges for weekends or evenings.
Are your engineers Gas Safe registered?
All our engineers are Gas Safe registered and DBS checked, with ISO 9001 and ISO 14001 certifications for quality assurance.
What boiler brands do you install?
We install leading brands including Ideal, Worcester Bosch, Vaillant, and Baxi with price-match guarantees on like-for-like quotations.
How often should boilers be serviced?
Annual boiler servicing is recommended to maintain warranty validity and ensure safe, efficient operation of your heating system.
Do you provide landlord gas certificates?
Yes, we offer CP12 gas safety certificates and tailored servicing contracts for landlords with priority weekend appointments available.
Can you install smart thermostats?
We install all major smart thermostat brands including Tado, Hive, Nest, and Salus with full system integration and user training.
Reviews (6)
Lee Batty
Jan 31, 2026
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Just moved in to the area swinton , we needed a gas safe check and boiler service , so i checked the reviews and kassgass came top , 2 very nice lads came round jack and is young apprentice. Did an exellent job top class, even showed how to put the presure up if needed , also recommended a carbon manoxide detector , of which i have ordered , also my shower head fell off they made sure it was conected properly , e mail the gas safe receipt of which i have now printed for my records , and the boiler service filled in grate jobs lads , booked for next year ..
Ryan O'Connor
Jan 20, 2026
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Boiler had broken down. Kassgas got to me promptly. Sorted the problem with parts with him. Absolutely fantastic service. The Engineer, Jack was so professional and explained everything to me and my landlord over the phone. Total bill was very reasonable!!! I will use Kassgas and recommend them to anyone.
Annabell Lee
Jan 18, 2026
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Billy and cade came and fixed radiator and central heating. Arrived on time. Was both really kind and helpful. Explained everything that needed doing. Quality work in quick time really chuffed with their work. Would highly recommend.
Aimie Tym
Jan 02, 2026
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Had Kassgas out to fit a new boiler for us before the cold months arrived, Billy & Matt replaced our old combi boiler for a brand new combi boiler. They explained everything to us before they left and gave us full confidence in our new boiler. Will definitely be using them in the future and would recommend to anyone who needs plumbers or gas engineers! Thank you!
Joanne Whittlestone
Dec 15, 2025
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We had Jack and Cade service our boiler, they are so professional, polite and friendly, an absolute credit to the company! They arrived on time and explained everything they were doing and what they had done. Thank-you guys! Would 100% recommend this company and I will be recommending them to family and friends
Acacia Heeley-Henson
Dec 02, 2025
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Twice now we have had Billy out to our home to help us fit a brand-new bespoke radiator and also rectify the absolute nightmare of a hive system that we had. And replace it with Tado Billys friendly and knowledgeable approach instantly put with ease in knowing everything was going to be sorted he communicated incredibly well with us always making sure we knew exactly what was happening with our home not only would I highly recommend this company but if you can get Billy to do the work youre onto a winner We are now for the first time in three years living in a heated home with no fault. Thanks for this company and Billys flawless work and attention to detail in making sure everything was in satisfactory working order. Thank you, Billy
