Click to expand Tap to zoom Viessmann Contact temperature limiter for underfloor heating systems - 7425493 by VIESSMANN SKU 7425493 Please call to check availability before ordering Live Chat / 01985 850982Under floor Heating Contact Temp Sensor. For limiting the maximum temperature of under floor heating systems. With connection lead, 1.5m long. Supports boiler, Vitodens 200-W, Vitodens 222-F Accessories