Feature	HMU Series	STE Series	TH Series	THD Series	HC-810M	HC-820W
Wattage	100–500	200–800	300–800	300–700	Up to 1000	Up to 1000
Heating Tube Material	Titanium	Titanium	Titanium	Titanium	Controller only	Controller only
Heating Coil Material	Steel	Nickel*	Nickel*	Steel
Control	Push	Push			Push	Touch
Display	Digital	Digital			Digital	Digital
Range	68–92°F	68–92°F			0–94°F	49.9–94°F
Out-of-water protection	✔ Non-resumable Fuse	✔ Non-resumable Fuse
3-Digit Display & Control						✔
1/10th Degree Calibration						✔
Japanese Components	✔	✔
UL STD / ETL Listed		✔

*Nickel coils sustain higher wattages, quicker heat dissipation, and superior build quality.