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Natural Refrigerant

Since 2006 all refrigerants are required to have a zero Ozone Depletion Potential (ODP).  This was legislated as part of the Montreal Protocol in an effort to protect the Ozone layer surrounding the Earth.

More recently, focus has been on the Global Warming Potential (GWP) of refrigerants.  The GWP is a measurement of the heat absorbed by a greenhouse gas in the atmosphere over a period of time, and is a standardized metric of how much a given pollutant contributes to Global Warming.

The GWP of a gas refers to the total contribution to global warming resulting from the emission of one unit of that Gas relative to one unit of the reference gas (CO₂), which is assigned a value of 1.

GWP’s are typically measured as the impact of that Greenhouse Gas over a period of 100 Years.

Many States and Provinces, such as California, are now scrutinizing refrigerant GWP’s and requiring the use of low GWP refrigerants, typically those with a GWP below 750.

R134a is the refrigerant most commonly used in Heat Pump Water Heaters (HPWH).

  • A single HPWH typically contains approx. 22oz (1.375lbs) of R134a.


  • 1lb of R134a has a 100-year GWP of 1,430.


  • Therefore, the refrigerant in a single HPWH has the potential for a contribution to Global Warming of 1,966.25 times an equivalent quantity of CO over a 100-year period.


  • A SANCO unit contains 22.9oz (1.43lbs) of CO


  • 1lb of COhas a 100-year GWP of 1


  • Therefore, the refrigerant in a SANCO unit has the potential for a contribution to Global Warming of 1.43 over the same period.

This represents a saving in Greenhouse Gas Emissions of 1,964.8, or by using the EPA (Environmental Protection Agency) online calculator at:

This shows a saving in greenhouse gas emissions equivalent to that produced by burning 100 gallons of gasoline or charging 113,000 smartphones.

The SANCO truly is the most environmentally friendly HPWH on the market!

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