The easiest answer to that question is to give us a call and tell us the area you are looking to heat, describe it to us or send us some photos and we can give you the answer to your questions.
This is the formula that we would use to calculate it and you can apply the exact same logic yourself at home or in any kind of business setting or environment:
As the video demonstration explains heat is subjective and the shape of the area to heat is an important factor. However as a general rule 1kW of heat output heats an area of up to 3 square meters. Indoors this can increase to 4 square meters
We generally recommend a 2kW heater for a 4sqm area and a 3kW heater for a 10sqm area.