ページの作成:「Most new boilers have an effectivity rating above 90%, whereas older boilers were round 60 – 70%; look out for the term A-rated as which means the boiler does in realit…」
(ページの作成:「Most new boilers have an effectivity rating above 90%, whereas older boilers were round 60 – 70%; look out for the term A-rated as which means the boiler does in realit…」)