When replacing an old thermostat with this newer control stat just use the connectors indicated common (C) and terminal one (1).
This is because on some old versions of Grant boilers, the control stat has just 2 terminals connectors.
Grant replacement boiler thermostat TPBS34
Delivered: 1 - 2 working days (UK, Priority Delivery)
£20.41 £17.01 exc VAT
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542470£22.10 £18.42 exc VAT View Product
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TPBS33, ZINDHSTAT£20.41 £17.01 exc VAT View Product