What if my heating load exceeds the 16 amps that one stat can handle?

The Warmup USTAT has a resistive load of 16 amps and may be used with both 120 and 240VAC systems. If you want to control more than 16 amps worth of heating via a single thermostat you will need to use Warmup's master thermostat & relay configuration. Instead of using the USTAT, a different model of master thermostat is used to control individual relay units (each capable of switching up to a 15 amp load, and each containing its own GCFI). The relays require their own separate electrical feed, and up to 10 relays can be daisy-chained to a single master unit via low voltage cabling.