Two types of gas absorption units have been installed in field tests in Germany. A larger capacity unit (140 kBtu/h or 41 kW heating) with 50-100% modulation was installed with an auxiliary boiler in a school building to replace a 150 kW boiler. In addition, smaller (61 kBtu/h or 18 kW heating) units were installed for residential applications, without auxiliary boilers. The measured savings over the baseline boiler systems have been up to 40%. This seminar describes the system layouts and how the savings were achieved.