Decisions, decisions

[Koaboy]

Setting up a 215-gallon reef tank that will have a sump that will hold up to 45-gallons (so, another 20 or so gallons). How would you set up heating? I like the idea found in here about running two heaters for safety. What size should they be?

 

[HVAC Guy]

I run 3 250-300w Eheim Jaegers staged slightly on their internal thermostat all powered from a Ranco controller for safety from overheating. Heaters will always fail sometime. On or off. A $65 Ranco can save the tank.