ページの作成:「Most new boilers have an efficiency rating above 90%, whereas older boilers have been round 60 – 70%; look out for the time period A-rated as this means that the boiler…」
(ページの作成:「Most new boilers have an efficiency rating above 90%, whereas older boilers have been round 60 – 70%; look out for the time period A-rated as this means that the boiler…」)