I wanted to share the number one reason why a Tankless Water Heater although is efficient over a typical residential water heater is not a wise choice for a California Home installation. The potential earthquake and its resulting devastation in regards to the delivery of fresh water to the residential house could be disrupted or not exist for some time. The lack of storage of water at your home could mean a family might not have access to any water. The run on the stores for bottled water and the inability to travel to get water could also be a severe problem. I have not seen any discussion or reference on the Tankless Water Heater to this type of disclosure. I refer to this link:

https://homebuysblog.com/2011/06/24/three-reasons-not-to-buy-a-tankless-water-heater-if-you-live-in-simi-valley/