I live in California, and I currently have a (too small) tank gas water heater in the house I've just bought. Gas heating is supposed to be be cheaper than electric heating in California. However, all the tankless gas heaters I've looked at seem to have low user satisfaction, while the Stiebel Eltron Tempra electric has high reviews. Can anyone give advice on whether to go for a gas or electric tankless water heater? Thanks.