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Johnson & Starley QuanTec HE24S review

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System boilers, such as the Johnson & Starley QuanTec HE24S, can be a good choice for homes with multiple bathrooms, as hot water is stored in a separate cylinder, which can supply more than one tap at the same time. Heating engineers tell us these condensing gas boilers are well built, but is it easy to source parts if they break down? Read on to find out.
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