If it is the combi version make sure the heating running temperature is drastically reduced from the factory settings or ideally fit a weather sensor.
If it is the system boiler still look at weather compensation and dual flow temperatures.
Remember that this is a very long term investment for the property. A few hundred pounds extra spent on controls and design will pay themselves back over the lifetime, and be transferrable to the next boiler.
I have been fitting these boilers longer than Intergas have been selling directly in the UK.
If its in Leamington or Cov area then I could have a look this afternoon if you called me by lunchtime.
Problem is that words do not describe what the likely price is. Upgrading a gas supply can be one metre or thirty metres. Could be 28 mm tube or 35 mm tube!
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