Dear customer, first start and warranty activation of your THERMOSTAHL product is done exclusively by an authorized Service Partner, in accordance with local regulations and producer manual instructions.  

IMPORTANT BEFORE START-UP

• All hudraulic connections must be executed according to instructions and checked that are water-tight
• Installation is filled with water and pressure is within given parameters
• Chimney connection is executed according to instructions
• Heating pump and recirculation pumps are connected correctly
• Return temperature protection system is installed
• All safety devices given according to producer instructions and local regulations (safety valve, expansion vessel, overheating protection heat exchanger) are connected. No valves are allowed between the boiler and safety devices!