Here's an interesting question regarding thermal efficency etc. and British Gas's recent (successful) attempt to f
k up all our work and expense...
We have a 30-odd year old place, that had single glazed wood windows from new.
At great expense, I had the latest double-glazed units and doors fitted, and the loft insulated and then boarded over too (useful storage as well as insulation).
The house was noticeably warmer and less draughty, and we could turn the heating thermostat down quite a bit since. Good result.
Until - British Gas came to do their yearly service on our warm-air heating system.
It's a basic system, that uses a gas burner and an electric fan that blows air across the burner and then into the house via trunking and grilles in the ceilings and walls. It's not expensive to run, it's been utterly reliable, and we like it very much, and would not want to replace it with a water boiler and radiators.
The unit is situated in an upstairs hallway cupboard. For the last 30 years, it's happily used two metal trunking pipes that go up out of the top of it's cupboard, up through the loft space, which terminate in the ridge of the house's roof, via two separate vented ridge tiles.
One pipe is for the fresh air inlet for the burner / heat exchanger, and the other is for venting combustion gases.
Over the last 30 years, it's worked perfectly, no-one has died from Carbon Monoxide poisoning (I even have a CO alarm hanging in the hallway by the system) and there have been no fires, breakdowns or any dramas.
Last year, the BG bloke arrived, 12 months after the last one who gave it a clean bill of health the year before, and with furrowed brows and much sucking of air through teeth, condemned our system as being dangerous and lethal (I was at work when this happened btw) and turned off the gas supply, switched off the electric, and hung a load of bright yellow notices on the unit warning that we would all die terribly if it was switched on
Turns out the 'regulations' have all changed, and the fix (which we paid them to do at great expense) was to go into the loft, uncouple the fresh air intake trunking and blank it all off, cut two huge holes in the door over the appliance, and fit two massive grilles.
Then, they went downstairs into the lounge, drilled a huge 6-inch diameter hole into the lounge wall / brickwork, and fit a grille over it outside and inside.
So basically, instead of the heating system drawing fresh air down from the roof apex inlet, it now draws it's air in from the cupboard itself, via the new door vents and basically through the entire house via the new vent in the lounge.
Very quickly, we began to notice a hideous cold draft in the lounge from this bloody vent - thus negating all the expense of insulation and double glazing!
So of course, we now have a heavy book blocking the flipping vent to stop the draughts.
The heating system seems to be plodding on ok as usual - and the CO alarm has't gone mental yet.
So, the question is - why? Was it the correct thing to do on their part with regard to 'new' regulations? Why is it better / safer than the original setup?
And why is it deemed to be acceptable to introduce a huge, heat-losing grille into the living space of a house, especially in light of how we're all trying to insulate our houses as best as possible, save money on heating, and eliminate draghts????
Maybe a heating / gas engineer can enlighten me...