justin;629278; said:My pond is 400 gallons and is outside. I use one 500 watt heater and keeps my water at 78 even when it hits 30 outside.
blacksmith37;630124; said:3415 BTU = a kilo watt hr. Will your room be heated ? In a room of 70F it wouldn't take "much" to heat a covered tank to 76F. You need to define some variables.
My experience is that VisaTherms are not remotely as reliable as Ebo Jager ( I am not connected to either ).