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• 'XS' Domestic Immersion Heater Standard immersion heater suitable for most vented domestic cylinders.

• 'XT' Domestic Immersion Heater Standard immersion heater fitted with a separate over-temperature safety thermostat. Suitable for most vented and unvented domestic cylinders.

• 'DP' Economy Tariff, Domestic Immersion Heater Off-peak, economy tariff immersion heater with on-peak boost facility. Suitable for most vented domestic cylinders.

• 'SA' Screw In, Fixed Rod Element Heater Single phase immersion heaters ranging from 1kW to 6kW in 1" to 1½" BSP. Suitable for domestic, building services and commercial applications.

• 'RX' Screw In, Fixed Rod Element Heater Single and three phase immersion heaters ranging from 1kW to 12 kW in 2" and 2¼" BSP. Suitable for domestic, light industrial, building services and commercial applications.

• 'WR' Screw In, Fixed Rod Element Heater Single and three phase immersion heaters ranging from 1kW to 24kW in 1" to 2½" BSP. Suitable for calorifiers, water cylinders, industrial and outdoor applications.

• 'WT' Screw In, Fixed Rod Element Heater with Low Water Protection Single phase immersion heaters incorporating low water protection. Suitable for steriliser and commercial applications. 1kW to 6kW in 1½" to 2½" BSP as a standard range. Higher kW loadings and three phase specifications can be supplied.