View From the right
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Boiler Detail from the right. On the left is the Economizer for the boiler fill/water tap, on the right the Presostat (a microswitch with a rubber membrane).
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Boiler detail with economizer on the left.
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Boiler detail with presostat. The pipe on the right side of the boiler goes to a rubber membrane on top of a brass plate which drives a micro switch (hidden under the black cover).
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