CAUTION: Do not expose this heater to the elements (such as rain, etc.). WARNING! Improper installation, adjustment, alteration, service or maintenance can cause injury or property damage. Refer to this manual. For assistance or additional information, con- sult a qualified installer. WARNING! Do not modify this heater. Use it only as described in this manual. Any other use not recommended by the manufacturer may result in fire, electric shock or per- sonal injury and void the warranty. WARNING!