Going on the recommendation of someone who has recently fitted two boilers is perhaps a little premature.
A boiler installer working on his own could have easily fitted 20 units since Christmas, but would probably be too busy to participate on this forum.
In other words a sample of 2 means nothing much.
By all means consider the Intergas. But see the whole picture, namely;
- very small UK importer
- no of boilers installed base miniscule in the UK
- no service force, they have to rely on installers for warranty
- many other manufacturers have built similar units over the last 25 years without diverters, plate heat exchangers etc, and dropped the idea later
- such as Worcester Bosch, for example
- It's a budget unit
- volume installers like me have heard the 'zero defect' story before, many times, usually from Dutch manufacturers
So, in other words, it is a niche, cheaply made unit. It may have merits, but it is too early to say. If they dont achieve significant market penetration in what is a very competitive market full of competent products, they'll be gone.
Your choice, just keep your eyes open.
I'll keep fitting Bosch, Vaillant and Viessmann because they are all solid companies, and they look after my customers very well, Bosch especially worthy of merit in this respect.