22mm. Maintains minimum flow rate in heating systems fitted with thermostatic radiator valves. The Automatic By-Pass opens when the TRVs close, thus ensuring a quiet operation. High quality, reliable, just set and forget. Specifications: Working temperature 120°C. Intermittent, working pressure 16bar.

Electronic sensing element. 2 wire installation. Override facility. EN 60730. Specifications: Switch/contact rating: 2(1)A 230VAC. Temp. range: 5° - 30°C. H x W x D: 87 x 104 x 44mm. 2 x AA batteries supplied.

Electronic sensing element. 2-wire installation. Override facility. Holiday mode. Automatic BST/GMT time change. Made in accordance with EN 60730. Specifications: Switch/contact rating: 16(2)A 230VAC. Temp. range: 5°-32°C. H x W x D: 95 x 134 x 30mm. 2 x AA batteries supplied.

Electronic sensing element. Wireless. Override facility. Made in accordance with EN 60730. Specifications: Switch/contact rating: 16(2)A 230VAC. Temp. range: 5°-32°C. H x W x D: 100 x 140 x 90mm. 2 x AA batteries supplied. 30m straight line transmitter range.

Electronic sensing element. 2-wire installation. Override facility. Holiday mode. Automatic BST/GMT time change. Made in accordance with EN 60730. Specifications: Switch/contact rating: 16(2)A 230VAC. Temp. range: 5°-32°C. H x W x D: 95 x 134 x 30mm. 2 x AA batteries supplied.

Electronic sensing element. Wireless. Override facility. Made in accordance with EN 60730. Specifications: Switch/contact rating: 16(2)A 230VAC. Temp. range: 5°-32°C. H x W x D: 100 x 140 x 90mm. 2 x AA batteries supplied. 30m straight line transmitter range.

Electronic sensing element. Wireless. Override facility. EN 60730. Specifications: Switch/contact rating: 2(1)A 230VAC. Temp. range: 5° - 30°C. H x W x D: 100 x 140 x 90mm. 2 x AA batteries supplied. 30m straight line transmitter range.

White finish. Suitable for use with the Drayton EB body range. Frost protection to 10°C. Positive shut off. Approved to EN215.