I would get a plug in watt meter, and measure how much power you are drawing. Most have a min/max tracking function and are really useful to have around the house. My guess is that you aren't pulling anywhere near that much power, and if you do pull that much for a short period of time it shouldn't do much more than blow the herpstats fuse.
Here is an excerpt from the spyder robotics website:
Many of the 500 watt thermostats out there use 4-8 amp triacs. The Herpstat products use 15 amp triacs. This means they "in theory" can handle up to 1800 watts. However, things like board trace size and heat generation limits these devices so the Herpstats are fused at lower ratings which protect the device. The cost difference between the high quality triacs I use and the triacs in other thermostats is about $0.50. Personally I thought it was money well spent.
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