Is this your business? Claim this free listing to add your details, photos and start receiving enquiries.
Claim this listing4.9
460 Google reviews
1–2 days
Typical install time
£7,500
BUS grant amount
Grand Union Plumbing & Heating Ltd is an MCS certified air source installer based in Buckinghamshire. They are registered with the Boiler Upgrade Scheme, meaning they can help you claim up to £7,500 towards your installation.
Based in Buckinghamshire, MK9 2UB
Areas served:
4.9
460 Google reviews
Based on verified Google reviews
Mariam Hussain
Fantastic bathroom renovation - highly recommend Grand Union Plumbing & Heating! A big thank you to Glen and the team for providing an excellent service throughout the whole process. Glen worked with us to plan the bathroom space to our budget & we’re super pleased with the final result of our bathroom installation. A big shout out & thanks to both Connor and Luka who did a fantastic job in transforming the space into a modern-day bathroom. They were both punctual, hard working, skilled and kept us updated on the status of the renovation work throughout the 2 weeks. Sam, also did a terrific job with the tile work. Looking forward to working with Glen & the team on future projects and would definitely recommend the company to family and friends.
Pwint Thi Han
I recently had a new water softener installed by Grand Union Plumbing, and I’m so happy with the whole experience! After dealing with other plumbers who either said my softener was too big or suggested awkward setups that would waste space, I was fed up and decided to find a reliable company online. That’s how I found Grand Union and I’m so glad I did. From the very first call, everything was smooth and professional. They asked me to upload photos of the job, sent SMS updates when the engineer was on the way, and arrived right on time. Mitchell was the engineer who came, and he was just fantastic. He was friendly, polite, and super respectful of our home. From the very first site visit he even took his shoes off before coming in without me asking! The installation was done efficiently, neatly, and with so much attention to detail. He even wiped footprints off my tiles that he’d made after the installation! How often does that happen? He gave great advice on where to place the softener and single-handedly modified the under-sink plumbing, cut the shelf, and got everything installed perfectly. Within a few hours, our water was softened, and everything looked neat and tidy. I honestly can’t recommend Grand Union and Mitchell enough. It’s such a relief to meet someone who’s not just highly skilled but also genuinely friendly. It made the whole process so easy and pleasant. I’m even thinking of getting them to do my annual boiler check!
Victor Marathoner
Booked the annual boiler service with Gran Union Plumbing & Heating. All very easy from booking to service day with constant text updates on a 3 hour window for the job plus “exact-to-the-minute ETA” on the day so you’re always well informed. The technician very knowledgeable, had to drill some holes in a new boiler cupboard the kitchen fitters install and did it without issue and cleaned after. Service book and digital certificate provided at the end of the job. Great service and good value. Highly recommend
Igor
We recently had a visit of an engineer from Grand Union Plumbing and Heating to address a boiler leak issue. The engineer arrived promptly and carried out a thorough assessment of the fault. After identifying the defective part, the repair was completed within just one day of the initial visit. Throughout the process, the engineer was friendly, positive, and highly professional. They took the time to explain everything clearly, which was greatly appreciated. Since the repair, the boiler has been functioning good. Highly recommended for their quick response, excellent service, and approachable attitude.
Norman Reed
A great bathroom en-suite installation by Grand Union. The guys were friendly, professional and very good at what they do. I shall be using this company again for my next project, the main bathroom.
Showing 5 of 460 reviews. View all on Google
We are MCS‑certified and registered with an approved consumer protection/competent person scheme, which is essential for quality assurance and to access grants like the Boiler Upgrade Scheme (BUS).
We carry out a detailed home assessment, including property type, insulation levels, existing heating system and available outdoor space, to confirm whether a heat pump is a good fit.
We design the system using a heat‑loss calculation for your home, then match the correct kW size and model (for example, air‑source vs ground‑source) so it runs efficiently and reliably.
Our fixed quote clearly lists the heat pump, cylinder, controls, labour, scaffolding (if needed), electrical work and any radiator or pipework upgrades, so you know exactly what you’re paying for.
Yes, as an MCS installer we can confirm your eligibility, apply for the BUS grant (worth up to £7,500) on your behalf and deduct it directly from your quote.
A typical air‑source heat pump installation takes around 2–5 days, and we’ll agree locations for the indoor and outdoor units, manage any planning considerations and keep you informed each day.
After the heat‑loss survey, we’ll advise if any radiators, pipework, electrics or hot‑water cylinder need upgrading so the system can run efficiently at lower flow temperatures.
Modern heat pumps are designed to be quiet and must meet UK noise regulations; we’ll position the unit to minimise any impact on you and your neighbours and comply with local planning rules.
You’ll get manufacturer warranties on the heat pump plus our workmanship guarantee, and we offer ongoing servicing and support to keep your system performing at its best.
We’ll estimate your likely annual running costs and potential savings based on your current fuel type, insulation level and tariffs, using real‑world performance data rather than lab figures.
Boiler Upgrade Scheme
Up to £7,500
off your heat pump installation
This installer handles the full BUS grant application — deducted directly from your quote. No upfront payment needed for the grant amount.
Scheme open until 2028 — limited funding available
Check your eligibilityReady to get a quote from Grand Union Plumbing & Heating Ltd?
Free, no obligation — we'll connect you directly