Most overhead gas outdoor heaters and some mushroom-shaped patio heaters require 24 volts for their ignition and control circuits. A transformer is necessary to reduce household current (typically 120 volts AC) to 24 volts AC.
We suggest 20 VA of rating, or more per patio heater. So if you have three outdoor heaters we suggest three 20 VA transformers, two 40 VA transformers, or one 75 VA (or greater) transformer, to control three patio heaters.
In the case of Schwank brand outdoor heaters, they suggest 40 VA of rating for the first patio heater and 20 VA of rating for each additional patio heater. So if you have three Schwank outdoor heaters you will need three 40VA transformers, two 75 VA transformers, or one 100 VA (or greater) transformer, to control the three Schwank heaters.
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