New Unboxed. The Worcester Bosch Filling Key is a compact storage tank water heater designed for wall mounting. With a high energy efficiency rating of A+++ and a white plastic tank lining, this gas boiler filling key is an ideal choice for efficient heating in your home. Made by the trusted brand Worcester, this model (87161045910) is powerful and reliable, providing hot water efficiently and effectively. Perfect for heating systems that require a boiler, this product is a practical and efficient addition to any home heating system.
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