Save Your Pennies for 2 Wraps of Clean Bare Titanium & Get Dollars Back in Electric Savings
Because Titanium is so costly heat pump manufacturers have looked at various alternative heat exchanger tubing materials and designs to try to lower their manufacturing costs. Some use only one wrap of titanium tubing in their heat exchanger which drastically reduces efficiency (COP).
In fact Heat Siphon uses TWICE as much titanium as two of our leading competitors.* A comparison of COP ratings will confirm this.
Another potential solution is to use less expensive copper tubing just like the gas heaters do. After all, copper is a very good heat conductor.
The problem with bare copper is that it will rapidly corrode in high chlorine pool water and a green copper oxide coating will form which is a very poor heat conductor. Worse yet, if corrosion continues then the tube wall will leak and ruin the heat pump system.
To protect the copper some manufacturers have looked at various plastic coatings, however, plastic coatings are just as bad as copper oxide at heat conduction. They insolate the hot refrigerant gas inside the tube from the water outside, lower heat transfer efficiency. This increases the compressor watts and lowers your COP.
In fact, all plastic materials have a heat tranfer coefficient less than 1% of copper or titanium metal, so even a thin coating of any type of plastic will significantly decrease heat transfer and efficiency.
Only the thinnest coating can even hope to come close to bare Titanium in heat conduction and even then the thinner it is the more likely it is to have a small pinhole or incomplete coverage of the vulnerable copper tube underneath.
HEAT SIPHON uses PURE Uncoated Bare Titanium Heat Exchanger Tubing to eliminate all corrosion and maximize heat transfer efficiency.
That's one of the reasons we have the highest COP (coefficient of performance) in the industry.
HEAT SIPHON HISTORY- In the early 1980's, before Bill Bernardi designed the first Heat Siphon, he was product development manager for a small company called EUS and worked on their heat pump pool heater. 
While there he helped design a copper coil heat exchanger dip coated in a thin blue polymer resin to protect it against corrosion. It proved to be too inefficient and risky in his opinion.
In late 1982, along with everyone else, he was laid off when EUS had severe financial problems. He decided to continue his pool heat pump work, and founded United States ThermoAmp Inc., the manufacturer of Heat Siphon. Over 30 years later EUS was sold to a major pool equipment manufacturer who still uses that same blue plastic coated heat exchanger to this day.
Penny in Your Skimmer