1. EFFICIENCY YEARS WATER-AMMONIA GAS ABSORPTION EFFICIENCY EVOLUTION 06050403 689198 02 ACC 0.53 ROBUR ENTERS INTO THE ABSORPTION TECHNOLOGY 0.71 ACF ACC/ACF = Chiller 1968 ARKLA (Arkansas Louisiana Gas Co.) introduces the first water-ammonia absorption units. From 1968 to 1991, more than 300,000 units are produced. 1991Robur Corporation was established to acquire absorption technology from Dometic, a company of Electrolux group. 1998the gas efficiency in absorption units was improved by 34%. Efficiency was becoming a crucial element.

2. EFFICIENCY YEARS 06050403 689198 02 ACC 0.53 ROBUR ENTERS INTO THE ABSORPTION TECHNOLOGY ACF HR ACF-HR = Chiller with Heat Recovery In 2002the unit with heat recovery was developed and introduced to the market. The heat recovery for production of domestic hot water at temperature up to 85°C makes the unit very competitive: the total efficiency of the unit is up to 173%. 1.73 0.71 WATER-AMMONIA GAS ABSORPTION EFFICIENCY EVOLUTION ACF

3. EFFICIENCY YEARS 06050403 689198 02 ACC 0.53 ROBUR ENTERS INTO THE ABSORPTION TECHNOLOGY 0.54 1.39 W LB GAHP-W LB = Heat Pump engineered for ground source energy use for ALTERNATE production of hot and chilled water In 2003Gas Absorption Heat Pump (GAHP-W LB) in water-water version was introduced to the market: a worldwide innovation. This GAHP version has put Robur into the high efficiency heating market with an efficiency much higher than electric compressor units. 0.71 WATER-AMMONIA GAS ABSORPTION EFFICIENCY EVOLUTION ACF

4. EFFICIENCY YEARS 06050403 689198 ACC 0.53 ROBUR ENTERS INTO THE ABSORPTION TECHNOLOGY 1.44 A GAHP-A = Heat Pump for heating only In 2004 Air Source Gas Absorption Heat Pump for heating only was introduced to the market. One more worldwide innovation. The efficiency is higher than condensing boilers. A new opportunity for Robur with an exclusive product. It is the most efficiency unit in gas heating worldwide. 0.71 02 WATER-AMMONIA GAS ABSORPTION EFFICIENCY EVOLUTION ACF

5. EFFICIENCY YEARS 06050403 689198 02 2.17 W GAHP-W = Heat Pump for SIMULTANEOUS production of hot and chilled water ACC 0.53 ROBUR ENTERS INTO THE ABSORPTION TECHNOLOGY ACF In 2004a new Ground Source Heat Pump version, derived from W LB, was introduced to the market: the W. Another worldwide innovation for simultaneous use of hot and chilled water. A new market to discover for Robur. 0.71 WATER-AMMONIA GAS ABSORPTION EFFICIENCY EVOLUTION

6. EFFICIENCY YEARS 060504 689198 ACC 0.53 ROBUR ENTERS INTO THE ABSORPTION TECHNOLOGY ACF 0.67 1.40 AR GAHP-AR Reversible Heat Pump for ALTERNATE production of hot and chilled water In 2005first Heat Pump for heating and cooling, gas driven. WATER-AMMONIA GAS ABSORPTION EFFICIENCY EVOLUTION 0.71 03 02

7. EFFICIENCY YEARS 06050403 689198 02 2.17 GAHP-W Heat Pump for SIMULTANEOUS production of hot and chilled water W ACC 0.53 ROBUR ENTERS INTO THE ABSORPTION TECHNOLOGY 0.71 ACF ACC/ACF Chiller GAHP-W LB Heat Pump engineered for ground source energy use for the ALTERNATE production of hot and chilled water 0.67 1.39 W LB GAHP-A Heat Pump for heating only 1.44 A ACF-HR Chiller with Heat Recovery 1.73 ACF HR 1.40 GAHP-AR Reversible Heat Pump for ALTERNATE production of hot and chilled water AR 0.54 WATER-AMMONIA GAS ABSORPTION EFFICIENCY EVOLUTION