THE GUARDIAN AQUARIUM HEATERS:
The Guardian heater is fully submersible and indestructible. The Guardian was designed to successfully pass 12 rigorous safety tests. This is a very safe choice for your fish. Listed below are the 12 reasons why.
1. Dropped 3 times from a height of 3 feet onto a hardwood sureface - No unsafe results.
2. Line Cord - Withstands 35 ponds of pulling force without components disassembling.
3. Line Cord - Heavy duty exceeds rated heater voltage & waterproof.
4. Thermal Protector - Resettable switch cuts off power if temperature exceeds 185 degrees out of water.
5. Double Insulated - No current leakage.
6. Was submersed in water, after reaching maximum heat - With no dielectric or physical damage.
7. Plastic parts flammability test - Won't Support combustion.
8. Metals and connectors mechanical - not soldered.
9. No glowing or flaming at highest temperature with heater out of water.
10. Dielectric tests - 2,500 volts with no insulation breakdown.
11 Heat aging - All elastometric seal materials heated to 212 degrees for 70 hours - No problem of hardness or flexibility.
12. Production line testing - Every heater is tested in production.
I just got a stealth and so far so good.
Quick question, what size tank do you have? You may not have enough wattage and end up going through so many heaters because they stay on constantly and wear down faster. Also if the room is usually kept cold then that might also affect the amount of time the heater runs and effectivly how fast it wears down.