Practik Lux Eco. - Minimum: 7.5 kW. - Nominal: 9.5 kW. - Maximum: 12 kW. Oven (W/D/H): 43 cm / 46.5 cm / 23 cm. Levels of the Oven: 2. Pipe Construction Ltd. Pipe Construction Ltd. is your supplier of stoves and fireplace inserts, with more than 15 years of experience in the area.