Project Description

Worcester Combi Installation

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Old properties tend to present an interesting set of challenges, and this project was no different. In addition to the age of the property, though, the customer was building an extension and needed the boiler system to be moved from the kitchen up in to the loft.

They were also looking to replace a traditional set up with a new combi system, which meant as well as removing the existing boiler, we had to also take out the loft tanks and cylinder. Thus, all in all, this project presented us with a few interesting considerations:

  • A new 22mm gas supply was required.

  • The thickness of the walls was significant.

  • There was asbestos in the garage roof.

Why did they choose Grand Union Plumbing & Heating?

Our team of gas registered heating engineers have put in a fair few hours between them, and they’ve had experience of working in old properties. This project needed a proper appreciation of the challenges older homes can present.

What was our new boiler replacement process for this project?

The great news was that because the extension work was well underway we had easy access to the pipework under the floor; the floorboards had been removed. This enabled us to make the necessary pipework changes relatively quickly, including running the new 22mm gas supply from the stairs up to the loft. And it also helped when we needed to relocate some of the radiators too.

Having removed the existing boiler, along with its tanks and cylinder, we then set to on the interesting part of the project. For starters, a flue hole had to be drilled from the inside in order to avoid disturbing the asbestos in the garage roof. Due to the thickness of the walls, however, this took quite a bit longer than it normally would to ensure we didn’t damage anything. We also needed to facilitate condensate draining into the top of the soil pipe for internal drain away, which was located in the loft.

Once the new boiler was installed in the loft, we then fitted a new Worcester Bosch filter, added inhibitor back into the system, and bled the radiators. Then we fitted a new Worcester wireless thermostat/programmer, commissioned the new system, and registered the boiler with the manufacturer.

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The benefits of our solution

As we mentioned above, our team of seasoned gas safe registered heating engineers know their onions, so they were able to tackle the various challenges this project presented without causing extra disruption to the extension project also being completed.

There’s no doubt that the fact that the floorboards had already been lifted made our job easier. However, the thickness of the walls required skill and patience when boring the hole for the new flue; particularly as the alternative would have involved tackling asbestos. Older properties need a sympathetic but firm approach to get things right.

We always like to ensure that any new system we install will run efficiently, so we make a point of introducing inhibitor; which also has the added benefit of reducing fuel bills too.

In a nutshell:

  • Our heating and plumbing engineers have the knowledge and experience needed to tackle this type of project.

  • We had access to the best equipment for creating a new flue hole without damaging the property or garage roof.

  • The combi system we chose has a 10 year warranty.

After care

We always make a point of carrying out a full handover whenever we install a new boiler. Thus we:

  • Explained how the new system works.

  • Took our customer through the differences they’d experience with a combi boiler.

  • Demonstrated how to set heating and water timing.

We also took the old boiler and all packaging away to be disposed of in an environmentally friendly way.

Did we go the extra mile?

Inch by inch through those thick walls, we certainly did. And our attention to detail regarding the age of the property was greatly appreciated.

Does your boiler need relocating?

If you’re looking to relocate your boiler and replace it with a new combi system, , please don’t hesitate to give us a ring on 01908 034194. We’d be delighted to help you enjoy the best heating system for your needs.

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Areas we cover

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


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