T.F.
My husband is a licensed plumber in Vista. He has done several tankless water heaters. One of his customers has propane. When he got his first propane bill after having it installed he called to tell my husband to say thank you. He had just saved $200 on his bill. He has since put in 2 tankless water heater for this customers family members. My husband is out in the desert riding dirt bikes until tomorrow night. If you would like I can have him give you a call on Monday morning. He could come out and give you an est. to let you know what the cost would be. Just send me a personal message if you are interested.
Thanks
Tina