Personally, I wouldn't use a tankless in the current state of affairs! But, if I did, I would not want an electric one unless the rates were REALLY low...NG pricing in most places is much better bang for the buck. In either case, you may need to upgrade your service, either gas or (almost certainly) electric. A tankless system can work and depending on where in CA you live, you may have a better chance than some living where it's colder. You need to read the fine print on the available volume with various inlet temperatures. It's all about how much temperature rise it can provide. In some cases, to get a decent volume, you may need to run several of the tankless systems in series. If you have a large soaking tub, or expect to use multiple showers at the same time, you will need a substantial unit, or more than one. The costs to install and annual maintenance make payback questionable compared to a properly sized, decent gas WH. If you have the ability to install a waste heat recovery system (you'd need to have more than one story...they need a vertical drop to be efficient), you can make either system 'appear' bigger when showering. It does not help when doing something like filling the tub or the WM, or doing dishes since you aren't draining the hot waste water down the drain WHILE it's in use...you need it all up front, which is where a tank works best.