Funny you mention that, I had previously thought of repurposing that 10/3 for an EVSE, but vehicle electrification in the family is on hold for a bit as the financial situations and technology/costs align. The dryer is in the garage and the newly installed 14-30 is convenient if someone does happen by with a Tesla. Curiously that old 10/3 is red-black-white, I don't think they even make that any more - I assumed it's ok to wrap the white wire with green tape at both ends and use it for an EGC. Running the water heater on 120v is a Florida post-hurricane trick, but only as a temporary hookup, not sure I'd want to do that as a permanent setup.BrockWI wrote:You could certainly switch to electric. However electric, even at off peak rates will be more expensive than the cost of gas, but taking in to account you could ditch the monthly gas hook up fee it might be a wash. On the load side a Heat Pump or hybrid water heater would be close to the same cost as natural gas. You can disable the resistance part and only use the heat pump, the problem with that is recovery time. With two people and an 50+ gallon tank no problem, more people or teenagers taking showers and it wouldn't work.
Along those same lines in the first house (cabin) we owned had a 5 gallon 120v water heater. I put in a 80 gallon tank but the house only had a 60 amp service. So I disconnected the upper element and wired it so only the lower element would run, the 4800w 240vac lower element and running at 120vac pulled about 1200w. It took 5 hours to recover from one shower but with only my wife and I at the time it worked.
So it depends on how your going to use it. Oddly enough it is similar to using a car on L1 or L2.
It looks like natural gas here in Phoenix is cheaper than what I guessed based upon the last time I had gas service. The current rate is $1.05/therm (includes $0.05/therm credit for fuel cost adjustment this month) and there is a $10.70 monthly service charge (not including taxes). I said I would never live in a gas neighborhood again after the present company bought the gas division from the electric utility and the residential gas cost went up 50% in one year. At that point, it was way cheaper to use electricity for everything. I have not checked gas prices lately so I was surprised to see they are about even with my electric costs (when I consider that the electric water heater is 100% efficient and a percentage of therms goes up the exhaust with a gas unit). My off-peak is between $0.04 and $0.05/kWh, depending upon time of year and fuel cost adjustments. My on peak rate includes a demand charge and I have a load controller to minimize the peak demand so energy cost is between $0.06 and $0.07/kWh (depending upon time of year and fuel cost adjustments).BrockWI wrote:Gerry out of curiosity what do you pay for gas / elect? Ours is $.061 for off peak electric and $.22 on peak and $1.00 critical peak. Our natural gas ranges from $.25 a therm to $1.10 a therm right now it is $.55. For us natural gas has to be above $1.40 a therm to match the $.061 of resistance off peak and we have never hit that, yet...