Heat settings
You might want to set seedling trays at 20 °C to germinate peppers, and salad grow
tubs at 15 °C. Read more online about the best growing temperatures for different
crops.
The large tubs at the bottom of a greenhouse could be set to 15 °C, but might not
achieve that temperature if it’s very cold outside. A single heater pad should be able to
keep a large grow tub at least 10 °C above ambient temperature (even when the
outside temperature is freezing).
The pads can reach a maximum theoretical temperature of 40 °C, so it’s possible to get
a small amount of soil very warm. The bigger the tub you try to heat, the slower it will
heat up, and the more heat will be lost at the same time as heat is being put in, so you
have a lower achievable maximum temperature.
Place your temperature sensors somewhere sensible so that they report the
temperature of the soil you’re heating, rather than the temperature of the heater pad.
Keeping one or two large tubs in the base of your Harvster warm will also keep the air
temperature in the Harvster to a reasonable level.
Put any ground-level heated tubs on an insulating layer of wood, if possible, to keep
them off the cold ground.
The power supply can provide up to 150 Watts of power. Each heater pad uses
approximately 15-20 Watts, which means you can in theory fit 8-10 heater pads. We
have provided outputs and splitters for up to 8 heater pads. The power supply itself will
give off a fair bit of warmth, and because that’s mounted inside the greenhouse, you’ll
get an extra boost.
