A:  Hello, There should not be a problem installing this unit in Washington. We always recommend to check with your local municipality to make sure you follow all codes. In the absence of local codes, use the latest edition of The National Fuel Gas Code, ANSI Z223.1, also known as NFPA 54*. This heater is designed for vent-free operation. State and local codes in some areas prohibit the use of vent-free heaters. Places that are listed in the manual that you can confirm would include American National Standard Institute, Inc. National Fire Protection Association, Inc. 1430 Broadway 1 Batterymarch Park. New York, NY 10018 Quincy, MA 02269-9101. Should you need any additional information, please feel free to give us a call at 877-447-4768 or email at customerservice@ghpgroupinc.com. Thank you! - GHP Group

A:  Hello Phyllis, We are sorry to hear about your experience. A customer service agent is on standby to assist with technical support. Please feel free to give us a call at 877-447-4768 or email at customerservice@ghpgroupinc.com. Thank you! - GHP Group

A:  Hello Jim, The owners manual cautions -Do not add extra logs or ornaments such as pine cones, vermiculite or rock wool. Using these added items can cause sooting. Do not add lava rock around base. Rock and debris could fall into the control area of fireplace. Should you need any additional information, please feel free to give us a call at 877-447-4768 or email at customerservice@ghpgroupinc.com. Thank you! - GHP Group

A:  Hello, a 100lb. propane tank is required for this appliance to function correctly. Should you need any additional information, please feel free to give us a call at 877-447-4768 or email at customerservice@ghpgroupinc.com. Thank you! - GHP Group

A:  You can use what ever size you want. It depends on your gas usage. Please consult with the gas company you want to provide the service to it