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The Heatrae Sadia Amptec flow heaters are electric boilers for central heating systems. They can power either electric radiators or wet underfloor systems and can work with standard pumps, thermostats and expansion vessels (not supplied). They range in power from 4 kW to 12 kW and where more than one is used, or they are used on the same circuit as a shower, a relay can be used. More details on Amptec models can be found in our Advice Centre articles on the right, but if you need to know anything specific, please call one of our experts on 01934 253600.