https://www.uswitch.com/energy/boilers/boiler-statistics/ has stats on boilers sold at 1.5m units per year. So the 19,200 figure he quotes is 57,600 as a minimum.
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What are these thumbnails man
https://www.uswitch.com/energy/boilers/boiler-statistics/ has stats on boilers sold at 1.5m units per year. So the 19,200 figure he quotes is 57,600 as a minimum.
What are these thumbnails man
