Christy, ambient heat is a big factor to consider aswell. Mine is a 1/4hp PC hooked up to three tanks total near 300gal. Tanks and chiller are located in the basement. Also its a lot cooler around here.
Its also nice to have a good dual controller of some type. Temp should stay pretty solid without having the chiller and heaters fighting each other.
I haven't experiened chiller fuse blowing problems as some others have.
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