Turlock Irrigation District sells you the power. PG&E sells you the gas. Neither one prices against the other, and that is what makes the gas versus electric question answerable here instead of a matter of opinion. Both published rates are below, inside the sum, with every assumption shown.
Local data last verified 20 Aug 2026
One house, one household's worth of hot water, four ways of making it. The only things changing from row to row are the technology and the price of the fuel it runs on.
Turlock Irrigation District electricity at 13.38¢ to 18.91¢ per kWh. PG&E gas at $2.784 per therm.
| Technology | Energy bought | Cost a year |
|---|---|---|
| Gas storage tankA standard atmospheric vent 40 to 50 gallon tank, the volume seller. Rated 0.60. | 165 therms | $458 |
| Gas tankless, condensingA condensing unit. A non-condensing one runs nearer 0.81. Rated 0.93. | 106 therms | $296 |
| Electric resistance tankA standard resistance element tank. Rated 0.92. | 3,147 kWh | $421 to $595 |
| Heat pump water heaterA typical ENERGY STAR 50 gallon unit in heat pump mode. Cold mornings in an unheated garage pull it down; hot afternoons push it up. Rated 3.45. | 839 kWh | $112 to $159 |
The electric rows carry a range because TID prices in tiers and water heating is a marginal load stacked on top of whatever else the house is drawing. A Central Valley home running air conditioning through a July afternoon is already past the cheap tiers before the water heater switches on. The gas row is a single figure because we hold one published bundled average, which is a weaker piece of evidence and is shown as it is rather than dressed up as a range.
Assumes 55 gallons a day at 120°F against a 61°F yearly mean incoming temperature, and a non-CARE gas household. On CARE, read every gas figure here as roughly a fifth lower.
The heat pump wins, and by less than the category advertises. Against a standard gas tank it saves somewhere around $300 to $346 a year. That is real money and it is not a fortune. On fuel alone it does not pay back a four thousand dollar job quickly, which means the TID rebate below is doing more work in the first few years than the efficiency is. Anyone selling you a heat pump on energy savings alone has not done this division.
Electric on its own is not the cheaper fuel here. Swap a gas tank for a plain resistance electric tank in Turlock and at the bottom TID tier you break about even, while at the top tier you are roughly $137 a year worse off than the tank you replaced. When people say electrification saves money, the saving is coming from the efficiency of the heat pump rather than from the price of TID electricity.
Tankless saves about $163 a year on gas. A tank to tankless conversion costs a few thousand dollars more than a straight tank swap, so do that division before you commit. Tankless earns its price on endless hot water and on the floor space it gives back. In Turlock it does not earn its price on the gas bill. We have a whole page on when tankless is the wrong buy, and this is the local number behind it.
Two live programmes from one utility, which is the best position of any market we cover. The amounts are easy to find anywhere. The qualifying conditions are where homeowners get caught, so they are here as well.
There is no single Turlock water. The city blends two supplies, and the difference between them is large enough to change what your installer should be telling you about maintenance.
Turlock draws from fifteen active wells and also buys treated surface water originating on the Tuolumne River through the Stanislaus Regional Water Authority. Those two supplies are not similar. In the city’s 2025 testing, groundwater total hardness ran from 26.2 to 154 ppm as calcium carbonate, and dissolved solids measured 237 ppm in the groundwater against 35 ppm in the surface supply.
Average those groundwater readings and you get 89 ppm, which is a number we could put in a headline and which would be true of almost nobody. A house at 154 ppm and a house at 26 ppm are not being given the same advice about a tankless heat exchanger. So the honest version is the range, plus the question that actually resolves it.
The city says the same thing in its own words: hardness varies with geology and groundwater conditions, and hard water causes scale in water heaters, pipes and appliances. If you are weighing tankless, this is the local fact that sets your descaling interval, and a house at the 154 ppm end of that range does not get the same maintenance schedule as one at 26.2 ppm. The people who can settle it for your address are your water provider and an installer who works your street.
Status: modelled, not measured. Stated here rather than buried because it changes which unit is the right size.
These ranges come from Stanislaus County contractor pricing collected around Modesto, fifteen miles up the road. We have not yet collected a first-party quote inside Turlock. They are the right order of magnitude and they are not a Turlock observation, and we would rather tell you that than let a borrowed number wear a local badge.
| Item | Range |
|---|---|
| Water heater unitEntry level 40 gallon up to a premium contractor line | $950–$2,200 |
| Installation labour | $650–$1,300 |
| Permit and inspection | $150–$400 |
| Code compliance itemsExpansion tank, seismic strapping, relief discharge, drain pan | $150–$500 |
| Haul away of the old unit | $50–$150 |
| Venting correctionsIf the existing flue does not meet current code | $300–$900 |
| Typical straightforward jobRequired items only | $1,950–$4,550 |
| If every upgrade appliesUncommon, but this is the ceiling | up to $5,450 |
Most of the spread sits in the first line. An entry level 40 gallon unit and a premium contractor channel model are the same job to install and roughly $1,200 apart to buy.
| Item | Range |
|---|---|
| Heat pump unit | $1,600–$3,200 |
| Installation labour | $900–$2,000 |
| Permit and inspection | $150–$400 |
| Dedicated 240V circuitDistance to the panel drives this more than anything else | $400–$1,800 |
| Electrical panel upgradeOnly if the panel has no capacity left | $1,500–$4,000 |
| Condensate routingA heat pump makes water and it has to go somewhere | $150–$600 |
| Capping the gas lineRequired, and documented, if you are claiming the TID $1,000 | $100–$400 |
| Typical straightforward jobRequired items only | $2,750–$6,000 |
| If every upgrade appliesUncommon, but this is the ceiling | up to $12,400 |
The panel line is the whole story on a conversion. Two identical houses on the same street land thousands apart on it, and it is the first thing to have an installer check, because it decides whether the TID rebate makes this an easy decision or a marginal one.
Take the required lines from both tables above. Replacing the gas tank runs about $1,950 to $4,550. Converting to a heat pump runs about $2,750 to $6,000. So the conversion costs somewhere around $800 to $1,450 more than the thing you were going to buy anyway.
Then apply the TID $1,000. That lands the heat pump between roughly two hundred dollars cheaper and four hundred and fifty dollars dearer than replacing the gas tank. On a straightforward job the rebate very nearly cancels the price difference, and the $320 a year that follows is close to free money.
That is the good case, and it depends entirely on one thing: whether the electrical is already there. Add a dedicated 240V circuit at $400 to $1,800 and the payback stretches to as much as seven years. Add a panel upgrade at $1,500 to $4,000 on top of that and it runs from about five years out to twenty, and twenty years is most of the unit’s life. Same house, same rebate, same rates, and a completely different answer.
So the thing to check first is your electrical panel: what capacity it has left, and how far it sits from the garage. That single answer settles this decision more reliably than any comparison of the two technologies. Get an installer to look at it before you get attached to either option, and read our tank versus tankless comparison if a third option is still on your list.
The City is unambiguous about this. Replacing a water heater requires a building permit. That is not a formality invented by conscientious contractors, it is how an inspection catches seismic strapping, the temperature and pressure relief discharge, venting and combustion air, which are the items that hurt somebody when they are wrong.
A conversion pulls in more than a swap does. Moving from gas to a heat pump adds electrical work and condensate routing. Moving from a tank to tankless adds venting, gas capacity and usually electrical. All of it has to meet the 2025 code Turlock has adopted, and all of it is easier to get right the first time than to correct at inspection.
If a contractor tells you a permit is unnecessary for a like for like swap, treat that as information about the contractor.
What we will not do is stand in for the Building Department. Anything that needs a code interpretation for your particular house is a question for them and for a licensed contractor who has seen it.
Fifteen miles north the answer changes, because the utility changes. See the Modesto page for that market, and note that a slice of eastern Modesto sits inside TID territory and gets the rebates on this page rather than the ones on that one.