Full Home with Tankless Water Heater Propane Usage
About This Setup
Full home propane using a high-efficiency tankless water heater instead of a traditional tank model for on-demand hot water and energy savings.
This configuration includes 4 propane appliances with a combined consumption of 1,978.1 gal per year at the national average baseline. Because this setup includes heating appliances, actual consumption varies significantly by state and climate zone. Colder states will use more propane while warmer states will use less. The recommended 1000-gallon tank requires approximately 3 delivery fills per year.
Per-Appliance Breakdown
The table below shows how each appliance in the Full Home with Tankless Water Heater 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 |
|---|---|---|---|---|---|---|---|
| Furnace 80,000 BTU | Heating | 80,000 | 8.0 | 6 | 1,277.5 gal | $3,193.70 | 64.6% |
| Tankless Water Heater | Water Heating | 199,000 | 0.5 | 12 | 397.2 gal | $993.04 | 20.1% |
| Propane Stove/Range | Cooking | 65,000 | 1.0 | 12 | 259.5 gal | $648.72 | 13.1% |
| Propane Clothes Dryer | Laundry | 22,000 | 0.5 | 12 | 43.9 gal | $109.78 | 2.2% |
| Total | 1,978.1 gal | $4,945.25 | 100% | ||||
Full Home with Tankless Water Heater Cost Across States
The table below shows how the total cost of the Full Home with Tankless Water Heater setup varies across representative states. Differences reflect both climate (affecting heating usage) and local propane pricing.
| State | HDD | Price/Gal | Gal/Year | Cost/Year | Tank |
|---|---|---|---|---|---|
| Alaska | 10,460 | $3.85 | 3,373.1 gal | $12,986.48 | 1000-gallon |
| Minnesota | 7,981 | $1.85 | 2,739.7 gal | $5,068.51 | 1000-gallon |
| Colorado | 6,128 | $2.55 | 2,266.3 gal | $5,779.07 | 1000-gallon |
| New York | 5,882 | $3.40 | 2,203.4 gal | $7,491.73 | 1000-gallon |
| Virginia | 3,960 | $2.75 | 1,712.4 gal | $4,709.06 | 1000-gallon |
| North Carolina | 3,320 | $2.65 | 1,548.9 gal | $4,104.50 | 1000-gallon |
| Texas | 1,711 | $2.30 | 1,137.8 gal | $2,616.88 | 1000-gallon |
| Florida | 683 | $2.95 | 875.1 gal | $2,581.61 | 500-gallon |
Similar Setups to Compare
The following setups have similar annual propane consumption to the Full Home with Tankless Water Heater configuration and may represent alternative appliance combinations worth considering.
| Setup | Appliances | Gal/Year | Cost/Year |
|---|---|---|---|
| Full Home with Tankless Water Heater (this setup) | 4 | 1,978.1 gal | $4,945.25 |
| New Construction Standard | 4 | 1,978.1 gal | $4,945.25 |
| Full Home + Gas Logs | 5 | 2,020 gal | $5,050.05 |
| Full Home + Fireplace | 5 | 2,059.9 gal | $5,149.85 |
| Dual Heating Zones | 4 | 2,075.9 gal | $5,189.77 |
| Hobby Farm Setup | 4 | 1,836.4 gal | $4,590.95 |
Optimizing This Setup
To reduce propane consumption for the Full Home with Tankless Water Heater 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 furnace 80,000 btu is the largest consumer at 1,277.5 gal per year.
For heating appliances, improving insulation and sealing air leaks in your home provides the most cost-effective reduction in propane usage. Every dollar spent on insulation typically saves $2-5 in fuel costs over its lifetime. Upgrading to a high-efficiency condensing furnace (95%+ AFUE) and installing a smart thermostat are the next best steps. Together, these measures can reduce heating propane consumption by 25-40%.
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 1,978.1 gal per year, a $0.30 per gallon savings translates to $593.43 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 "Full Home with Tankless Water Heater" setup use per year?
The Full Home with Tankless Water Heater configuration uses approximately 1,978.1 gal of propane per year at the national average baseline. This includes furnace 80,000 btu, tankless water heater, propane stove/range, propane clothes dryer. The estimated annual cost at $2.50 per gallon is $4,945.25. Monthly usage averages 164.8 gal but varies seasonally, with winter months consuming 283.8 gal and summer months consuming 79.9 gal.
What tank size do I need for the "Full Home with Tankless Water Heater" setup?
For the Full Home with Tankless Water Heater configuration consuming approximately 1,978.1 gal per year, we recommend a 1000-gallon tank. This requires approximately 3 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 a significant impact on the Full Home with Tankless Water Heater setup because it includes heating appliances. In cold states like Minnesota (7,981 HDD), heating consumption increases by approximately 60% above the national baseline. In warm states like Florida (683 HDD), heating consumption drops by about 86%. Non-heating appliances in the setup (cooking, water heating, etc.) are not affected by climate.
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