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WebWorcester Greenstar 28CDi Compact Gas Combi Boiler ERP 7733600054. £958.01 Excl VAT Inc VAT. Worcester Greenstar 36CDi Compact Combi Boiler 7733600056. Excl VAT Inc VAT. Ideal i-Mini C30 Combi Boiler 210808. £605.93 Excl VAT £727.12 Inc VAT. Ideal i-Mini C24 Combi Boiler 210807. WebBoilers marked as high-efficiency have AFUE ratings of 90% or higher. Electric boilers can have nearly 100% efficiency, and the best gas and propane models can reach 98.5%. Oil boilers top out around 95%, and … csf leak post sinus surgery

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