Project Description

Ideal Logic Heat Only Boiler Replacement

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It’s easy for people to assume that when a boiler is being replaced in the same location it’s a piece of cake. And for us, yes, we do consider the project to be a straight swap. But… there are always little differences that need to be considered.

For this installation, there were two great aspects that were to remain consistent: The existing 15mm gas supply was enough to supply the new boiler’s output. And the new flue could use the existing flue hole. However, there were some additional details that needed consideration:

  • The old boiler was not a condensing boiler, so…

  • A new condensate pipe needed to be added.

  • The owner wanted the new boiler to fit into a cupboard so it wasn’t visible.

Why did they choose Grand Union Plumbing & Heating?

Customers get peace of mind when they choose Grand Union Plumbing & Heating because we have a great team of gas safe registered heating engineers. However, not only have they been well trained, but their range of skills, as this project illustrated, extend to working with cupboards and paving too.

What was our new boiler replacement process for this project?

Our first consideration was which boiler to recommend. As mentioned above, the owner wanted the new one to fit in a cupboard, so we had to choose one that was the right size and had a rear entry flue option similar to their existing boiler. That’s one of the reasons we chose the Ideal Logic condensing boiler; the other was because it offers a 7 year warranty.

Though the new boiler was to be in the same location, we needed to add in a waste pipe because it was a condensing boiler. This meant we also needed to fit a soakaway under the paving that ran along the side of the house.

We then fitted a new system filter, bled the radiators, and added an inhibitor back into the system to ensure it operated efficiently. Our final task was to wire the new system into the existing thermostat programmer. We then commissioned the system and registered the new boiler with the manufacturer.

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The benefits of our solution

Our engineers understand that aesthetics matter. So ensuring that the boiler fitted into the existing cupboard, without disruption elsewhere, was a priority for them. They were also able to fit a new waste pipe without too much ado, and create a soakaway outside under the paving, and still leave everything looking as it had before.

As part of our a new boiler replacement process, we always like to ensure it will run as efficiently as possible and keep future gas bills low. Thus, we make a point of adding inhibitor to the system in order to increase its lifespan and keep things running smoothly.

In a nutshell:

  • Our team of experienced gas safe registered heating engineers are great at what they do.

  • We were able to meet the customer’s needs to fit the new boiler in an existing cupboard.

  • We chose a boiler with a great 7 year warranty.

  • We made it look like a straight swap… when it wasn’t; they now have a more efficient boiler.

After care

It is our policy to ensure there is a full handover whenever we install a new boiler. Thus we:

  • Explained the differences between the old system and the new one.

  • Took the customer through how the new system works.

  • Confirmed 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?

We did indeed. We made every effort to ensure the paving was replaced and looked just as it had before. And it did.

Does your boiler need replacing?

If you’re looking to replace your existing boiler with a new system that’s a little different, please don’t hesitate to give us a ring on 01908 034194.  We love working on making these changes so customers can enjoy the best heating system for their 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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