Tankless Water Heater Only Propane Usage
About This Setup
A propane tankless water heater as the sole propane appliance, delivering on-demand hot water with no standby losses.
This configuration includes 1 propane appliance with a combined consumption of 397.2 gal per year at the national average baseline. Since this setup does not include heating appliances, consumption is relatively consistent across states. Only the price per gallon varies by location. The recommended 250-gallon tank requires approximately 2 delivery fills per year.
Per-Appliance Breakdown
The table below shows how each appliance in the Tankless Water Heater Only setup contributes to the total annual propane consumption. Appliances are listed from highest to lowest annual gallon usage.
| Appliance | Category | BTU/hr | Hrs/Day | Months | Gal/Year | Cost/Year | % of Total |
|---|---|---|---|---|---|---|---|
| Tankless Water Heater | Water Heating | 199,000 | 0.5 | 12 | 397.2 gal | $993.04 | 100.0% |
| Total | 397.2 gal | $993.04 | 100% | ||||
Tankless Water Heater Only Cost Across States
The table below shows how the total cost of the Tankless Water Heater Only setup varies across representative states. Since this setup has no heating appliances, differences reflect local propane pricing only.
| State | HDD | Price/Gal | Gal/Year | Cost/Year | Tank |
|---|---|---|---|---|---|
| Alaska | 10,460 | $3.85 | 397.2 gal | $1,529.29 | 250-gallon |
| Minnesota | 7,981 | $1.85 | 397.2 gal | $734.85 | 250-gallon |
| New York | 5,882 | $3.40 | 397.2 gal | $1,350.54 | 250-gallon |
| Colorado | 6,128 | $2.55 | 397.2 gal | $1,012.90 | 250-gallon |
| Virginia | 3,960 | $2.75 | 397.2 gal | $1,092.35 | 250-gallon |
| North Carolina | 3,320 | $2.65 | 397.2 gal | $1,052.63 | 250-gallon |
| Texas | 1,711 | $2.30 | 397.2 gal | $913.60 | 250-gallon |
| Florida | 683 | $2.95 | 397.2 gal | $1,171.79 | 250-gallon |
Similar Setups to Compare
The following setups have similar annual propane consumption to the Tankless Water Heater Only configuration and may represent alternative appliance combinations worth considering.
| Setup | Appliances | Gal/Year | Cost/Year |
|---|---|---|---|
| Tankless Water Heater Only (this setup) | 1 | 397.2 gal | $993.04 |
| Space Heater Only | 1 | 359.3 gal | $898.23 |
| Outdoor Living Setup | 4 | 445.8 gal | $1,114.47 |
| Spa / Hot Tub Only | 1 | 332.7 gal | $831.69 |
| Cooking + Water Heater Only | 2 | 499 gal | $1,247.54 |
| Patio Entertaining | 2 | 286.1 gal | $715.26 |
Optimizing This Setup
To reduce propane consumption for the Tankless Water Heater Only configuration, focus on the appliance that uses the most propane first, as that yields the greatest savings per unit of effort. In this setup, the tankless water heater is the largest consumer at 397.2 gal per year.
For non-heating appliances, the primary optimization strategy is efficient usage habits. For water heaters, lowering the thermostat to 120 degrees and installing low-flow fixtures reduces consumption. For cooking, matching pot sizes to burners and using lids conserves propane. For outdoor appliances, running equipment only when actively needed rather than leaving burners on standby prevents waste.
On the purchasing side, shopping among multiple propane dealers can reveal price differences of $0.30-0.50 per gallon in the same area. At 397.2 gal per year, a $0.30 per gallon savings translates to $119.17 in annual savings. Pre-buy contracts, cooperative buying groups, and larger tank installations that qualify for bulk pricing are all effective strategies for reducing your per-gallon cost.
Frequently Asked Questions
How much propane does the "Tankless Water Heater Only" setup use per year?
The Tankless Water Heater Only configuration uses approximately 397.2 gal of propane per year at the national average baseline. This includes tankless water heater. The estimated annual cost at $2.50 per gallon is $993.04. Monthly usage averages 33.1 gal but varies seasonally, with winter months consuming 33.1 gal and summer months consuming 33.1 gal.
What tank size do I need for the "Tankless Water Heater Only" setup?
For the Tankless Water Heater Only configuration consuming approximately 397.2 gal per year, we recommend a 250-gallon tank. This requires approximately 2 fills per year. A larger tank reduces delivery frequency and provides a better buffer during winter peak demand, so consider going one size up if you are near the boundary between sizes.
How does climate affect propane usage for this setup?
Climate has minimal impact on the Tankless Water Heater Only setup because it does not include heating appliances. The propane consumption shown is consistent across all climates. The only state-level variation is the price per gallon, which affects the annual cost but not the gallons consumed.
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