Tool

Electric heater count planner.

Estimate how many equal-sized heaters can run on one or more known supplies before you send kit to a cold shop, office, workshop or site room.

How many electric heaters can this supply take?

Use this when the question is not one item, but “can we run two, three or four heaters at once?” It keeps the maths visible and conservative.

Supply voltage Supply rating Warning point Number of separate supplies/circuits Heater input watts each Other same-time load on each supply

Use input watts. If a heater advert says heat output and the label says electrical input, use the label value for this check.

Compare electric heater options after the supply plan looks realistic.