supply of electrical heater supply of electrical heater to the sericulture department. , technical specification ofelectrical heater electrical heaters to maintain the optimum temperature for the silkworm rearing shed. heaters must comply with international standards. energy-efficient models with low power consumption. designed for indoor use. must include safety features such as overheating protection, automatic shut-off, and thermostat control and digital thermostat. voltage: single phase 230v (two power setting 1000 watts/2000watts), frequency: 50hz heating element type: coil, night light indicator, adjustable height, and cool fan function. casing material: stainless steel mounting type:portable minimum warranty period: 1 year each one must be properly labelled with the following: product name, usage instructions, storage & safety instructions, and local service name & address isi/bis approved.