See II.1.1
maintenance (with total guarantee) of installations for heating and production of domestic hot water, rainwater recovery and water softening (individual and common gas and fuel oil boilers, as well as electric accumulation heaters)See II.2.1
maintenance (with total guarantee) of installations for heating and production of domestic hot water (common heat pumps, whether or not combined with common gas boilers)See II.2.1
maintenance (with total guarantee) of installations for ventilation.See II.2.1