• 18 KW ThermaKoi Unit AnalogMinium Flow 20 gpm up to any flow you want.Temperture range change from 40 degrees tp 100 degree's.for ponds up to 18,000 Gallons
  In the past it hasn't been easy to heat koi ponds, it meant getting plumbers out to run gas lines or propane lines. Now, with the ThermaKoi line of heaters, life just got easier for you and more comfortable for your koi.Made of 316 stainless steel and utilizing highly accurate electronic thermostats these units keep the water temp constant. Installs easily and quickly. Just plumb in line (2") entering the water at the end with the Safety flow switch and out the other end to the pond. Over load protected and built to last.
  18 KW ThermaKoi Unit AnalogMinium Flow 20 gpm up to any flow you want.
  
  
  Temperture range change from 40 degrees tp 100 degree's.
  
  
  for ponds up to 18,000 Gallons
  
  
  Made of 316 stainless steel and utilizing highly accurate electronic thermostats these units keep the water temp constant. Installs easily and quickly. Just plumb in line (2") entering the water at the end with the Safety flow switch and out the other end to the pond. Over load protected and built to last.
• Made of 316 stainless steel
• In the past it hasn't been easy to heat koi ponds, it meant getting plumbers out to run gas lines or propane lines. Now, with the ThermaKoi line of heaters, life just got easier for you and more comfortable for your koi.
• Highly-accurate electronic thermostats have unmatched precision, unlike standard thermostats which aren't as accurate
• Flow switches standard for reliability
• These units keep the water temp constant all year round.
• Installs easily and quickly -- plumb in line with included 2" slip union fittings. Simply flow in one end and out the other.
• Overload protected and built to last
• Heaters come with analog dial controls for easy setting - both the standard and digital display models have this dial
• On/Off indicator light makes it easy to know when the heating element is turned on and it is actually heating the pond water. When the light is on, the heater is heating. When the light is off, the unit is in standby mode until the thermostat engages the heating element.
• The perfect solution for the KHV heating protocol of koi!

Options:

For an additional $140, you can order the ThermaKoi heaters with a digital LED temperature display which shows the actual water temperature. Note: the heat temp of the Digital display model is controlled with the same knob as the base model.