Project Description

Worcester Bosch Greenstar 30i Combi Installation In Loft

Book Appointment
Boiler Installation Service

Need a new boiler?

Boiler Installation Specialists
Call us now

We are all keen to maximise the use of the space we have, and boilers take up lots of it… and they’re not the prettiest of things either. This client was keen, therefore, to move their boiler system from the kitchen up to the loft. And they thought it was a good idea to switch from a traditional set up to a combi boiler at the same time. Made a lot of sense to us too.

However, that did give us a lot to consider.

  • The 22mm gas supply was under the stairs.

  • The flue hole was obviously in the wrong place.

  • And… there was asbestos in the roof above the garage.

Why did they choose Grand Union Plumbing & Heating?

Our heating and plumbing engineers are all gas safe registered. So first off, the customer knew they were dealing with professionals with the necessary expertise. However, with our track record, we were able to talk through the challenges presented by the project with the customer and offer good solutions. They could tell we know what we’re talking about.

What was our new boiler replacement process for this project?

We had to get the basics in place first. A 22mm gas supply was required, so we had to chase a pipe from under the stairs, in the wall, all the way up to the loft. And only then could we get the new location set up for the new combi boiler.

The second key challenge was to create a new flue hole. And that was not quite as simple as it sounds. Normally, we’d simply use ladders to reach new heights, but in this case that wasn’t an option. The roof above the garage was lined with asbestos. Therefore, to gain the necessary access, we had to hire a cherry picker.

We then fitted a Magnaclean filter, bled the radiators, and introduced inhibitor back in to extend the lifespan of the system. We also installed a new wireless thermostat/programmer, recommissioned the system, and registered the boiler with the manufacturer.

Glow Worm Logo

The benefits of our solution

Our team of gas safe registered engineers know their onions, so installing the new gas supply pipework went smoothly and caused little mess or disruption. We were able to find a good solution to accessing the roof to install the new flue, which gave everyone peace of mind and kept the project costs down too.

We chose the Worcester Bosch Greenstar 30i Combi for many reasons, but it had exactly the right spec to meet requirements. Plus it also has an 8 year warranty. This meant our customers could free up that much needed space in the kitchen, and enjoy a lovely new look once they’d redecorated.

In a nutshell, therefore, the benefits of choosing us were:

  • Our fabulous team of heating and plumbing engineers work quickly and cleanly.

  • Their knowledge and experience enabled them to route the gas supply up to the loft from under the stairs without a hitch.

  • We didn’t run a mile when we realized that asbestos was involved; instead we found a great solution.

  • None of us has a fear of heights, thank goodness!

After care

If you’ve read any of our other case studies, you’ll realise that it is our policy to do a full handover when we install a new boiler. This involved:

  • Taking the customer through the differences between the old system and the new one.

  • Demonstrating how the new systems works.

  • Explaining how the new thermostat/programmer works.

We also always take away the old boiler, and packaging and bits, and dispose of the rubbish in an environmentally acceptable way.

Did we go the extra mile?

We most certainly did… that cherry picker was a great way to provide access where ladders couldn’t reach. And it introduced a different note to everyone’s day too.

Does your boiler need relocating?

If you’re looking to relocate your boiler system up into your roof, please don’t hesitate to give us a ring on 01908 034194. We love nothing more than overcoming the challenges that inevitably arise to ensure the results are exactly what the customer needs.

View more contact info

Areas we cover

  • Aylesbury
  • Bedford
  • Leighton Buzzard
  • Northampton
  • Olney
  • Towcester
  • Woburn Sands
Call us

What Our Customers Say

I’ve used Grand Union 3 times and every time the service is excellent and the price very reasonable. Engineers are very good at letting you know what they are doing and there are no hidden charges. They even managed to do a job at short notice. They work tidily and even followed up with a message to check my heating was still ok the following day. Highly recommend

Claire Edwards

Excellent service from Mitch!
Responsive, courteous and informative.
Work swiftly done too, with clear explanations throughout.
Thanks again, Mitch.

Used grand Union plumbing to service my boiler and couldn’t of asked for a better service. They were on time and actioned the job in a clean and professional manner. Very nice to see they were operating in a covid secure manner without being promoted too

100% will be used again in the future

Tom Holland
Highly recommend Grand Union Plumbing & Heating. We called Mitch after getting nowhere with the first 2 heating engineers we contacted. In contrast to them, Mitch quickly diagnosed the fault, ordered the part and replaced. Totally professional and good value for money.
Mike Kennedy
I found Grand Union on local heroes. Id given up on British gas and NPower/homeserve.
Mitch was honest from the get go. Came round and gave me quote got the worl done within a couple of days once parts came.
Very highly professional. Very friendly. Perfect on time. Clean. Safe. What else can I say. I will be using only Grand Union here on and cannot recommend enough.
Amazing service Mitch Andy and Cory all amazing guys came out Xmas Eve went above and beyond to get me sorted and were amazing with my children letting them watch and so polite couldn’t recommend highly enough 10/10
Steaves Jen
Highly recommend the team to fix any plumbing or heating issues. They arrived as scheduled and it was great to have such a high standard of service. Will definitely be my contact for anymore plumbing issues and for boiler services.
Owen Thomas
Contacted them after having three boiler services being cancelled by a Big Five company only resulting to a wait till May for the 4th appointment. From the first day I contacted them Andy came around in a week’s time and provided excellent customer service and serviced our boiler very efficiently and quickly. The appointment ran a bit late due to another emergency call but both Mitch and Andy were apologetic and polite. Appreciate there excellent customer service on top of a job done well. Will be calling on them in future again for sure. Thank you.
Kaanita Khan
Would highly recommend Grand Union plumbing, really knowledgeable team. They were able to identify the problem with our heating pressure gauge, and release valve really quickly and stop our leak straight away. Thanks
Emma Thompson
Love these guys, have been using them for years and will keep using them for years in the future. They’re helpful, do amazing work each and every time, and are respectful of your home, both Andy and Cory took their shoes off when they came into the house recently, Cory put down dust sheets when he was fitting my new radiator in the bathroom (tiled floor wipes clean, but still put it down).
100% recommend them for any and all plumbing works and looking forward to having them do more work for me later in the year.
Ian Kockelbergh

It’s not very often that you find a quality tradesperson who is reliable, honest, and competitive on his pricing. Mitch has done a number of jobs in our house, including installing a new boiler, water tank and radiators. All to a brilliant standard. I will happily recommend Mitch and Grand Union Plumbing!


I have called Mitch out twice since moving into our new house a month ago. Both times he has managed to fit in an appointment fairly quickly to resolve our issues. He has been professional and friendly, offering advice on other issues that I have seen. I would definitely recommend his services.

Simon Edwards

We have used Grand Union Plumbing several times as we had a really tricky fault. We found Mitch to be really excellent. Very happy to recommend, 10/10

Annette McDade

Called Mitch out on very short notice, extremely reliable and great rates, would highly recommend Grand Union Plumbing and Heating. Also provided advice with other queries aside from the job at hand- with no reluctance. Great service, thank you for your hard work and honesty Mitch.

Dushan Gnanakumar
Great service, polite, attention to detail. Would highly recommend.
Ajvinder Dhatt
Had a leak that needed fixing asap and Mitch gave me advice over the phone to deal with it until he could get to me, then came out within the hour on a weekend! Would highly recommend
Hannah Manners
Great company would highly recommend for any heating & plumbing issues
Terry Adolpho

Definitely recommend these guys. Had a job done by them and they wasted no time to get it done and made sure I was completely happy before any payments. Nowadays companies just want to rush and take your money. Big thumps up

Tevaugh Grant
We always use Grand Union for serving and any other unforseen problems. The service and professionalism is 1st class. Would definitely recommend!!
Stephanie Horne
A great company to do business with… I used them recently for an emergency with a domestic heating system which was rectified very efficiently. A second problem (some months later) and there was no decision to make, called them and they sorted it in no time with minimum fuss, mess and very reasonably priced.
Trevor Gordon

Have used Grand Union twice now. They are very quick to respond to enquiries, reasonably priced, tidy workers and very friendly. I can’t fault them. Definitely my go to guys now for any plumbing needs.
Highly recommended

Emma Verrall
Great service from Mitch. Have used a few times for boiler service, repairs and outdoor tap installation. Always very prompt service, turns up on time and reasonable prices. Would definitely recommend!
Jon Hood

I found Grand Union Plumbing through the Gas Safe Register. I had a boiler service and gas safety certificate. Mitchell was very professional and the prices were very reasonable. I would definitely recommend and use again.

Rebecca Hughes
Mitch was very helpful when fitting my new boiler – he was very fair about price and I couldn’t recommend Mitch enough. Thanks Mitch!
Reece Hussain


Use our calendar appointment request form and we will confirm back to you as soon as we can! We look forward to hearing from you.

Request appointment
Call us

Request a call back

If you have any questions regarding our services, would like to arrange a quotation or would like to book a call out please contact us using the form below. You can also request an appointment through our contact form. We look forward to hearing from you!