What Happens If Your Propane Tank Is Empty? Complete Guide
Everything You Need to Know About Running Out of Propane-Consequences, Costs, Safety Risks, and Prevention
Introduction: The Short Answer
What happens if your propane tank is empty?
Running out of propane causes immediate problems, safety hazards, and extra costs:
| Immediate Problem | Safety Hazard | Financial Cost |
|---|---|---|
| No heat | Air in gas lines | Emergency delivery fee ($50-150) |
| No hot water | Pilot lights out | Leak check required ($75-200) |
| No cooking | Improper ignition risk | Appliance damage ($100-1,000+) |
| No generator power | Carbon monoxide risk | Frozen pipes ($500-5,000+) |
The bottom line: Running out of propane is inconvenient, potentially dangerous, and always more expensive than preventing it.
This guide explains exactly what happens when your propane tank runs empty, the safety risks involved, the costs you'll face, and how to prevent run-outs.
Part 1: Immediate Consequences of an Empty Propane Tank
What Stops Working Immediately
When your propane tank runs empty, all propane-powered appliances stop working:
| Appliance | What Happens | Impact |
|---|---|---|
| Furnace | Stops heating | House gets cold rapidly |
| Water heater | Stops heating water | No hot water for showers, dishes |
| Stove/Oven | Won't light | Cannot cook |
| Clothes dryer | Won't operate | Cannot dry clothes |
| Fireplace | Won't light | No supplemental heat |
| Generator | Won't run | No backup power during outages |
| Space heaters | Shut off | Rooms get cold |
How Quickly Problems Develop
Timeline of problems after running out:
| Time | What Happens |
|---|---|
| Immediately | All appliances stop, pilot lights go out |
| 1-2 hours | House starts cooling (winter) |
| 4-6 hours | House uncomfortably cold, no hot water |
| 12-24 hours | Pipes at risk of freezing (winter) |
| 24+ hours | Potential pipe bursts, water damage |
In winter, an empty propane tank can lead to frozen pipes within 24-48 hours - causing thousands of dollars in damage.
Part 2: Safety Hazards When Propane Runs Out
Hazard #1: Air in Gas Lines
What happens:
When the tank empties, air enters the gas lines
Air pockets form in the piping system
Air cannot burn like propane
Why it's dangerous:
Air in lines prevents proper ignition
Can cause flashback when propane is restored
May create explosive mixture
What's required:
Professional must purge air from lines before restart
Cannot be done by homeowner
Hazard #2: Pilot Lights Extinguished
What happens:
All pilot lights go out when gas stops
Pilots on furnace, water heater, stove, etc. extinguish
Why it's dangerous:
Without pilot, gas may flow unburned when restored
Modern appliances have safety valves (older ones may not)
Risk of gas accumulation
What's required:
All pilots must be relit by professional
Safety check of each appliance
Hazard #3: Moisture in Lines
What happens:
Empty lines can draw in moisture from air
Moisture condenses inside gas lines
Why it's problematic:
Moisture causes corrosion in lines
Can freeze in winter, blocking gas flow
Reduces appliance efficiency
Long-term damage to gas system
What's required:
Lines may need to be purged and dried
Professional inspection
Hazard #4: Carbon Monoxide Risk on Restart
What happens:
Improper restart can cause incomplete combustion
Incomplete combustion produces carbon monoxide (CO)
Why it's dangerous:
CO is odorless, colorless, and deadly
Can cause illness or death
Symptoms: headache, dizziness, nausea, confusion
What's required:
Working CO detectors in home
Professional restart with combustion check
Never restart system yourself
Part 3: Financial Costs of Running Out of Propane
Immediate Costs
| Cost Item | Amount | Why |
|---|---|---|
| Emergency delivery fee | $50 – $150+ | Rush/after-hours delivery |
| Higher propane price | Variable | Emergency rates often higher |
| Leak check/service call | $75 – $200 | Required by law in most areas |
| Pilot relighting | $50 – $100 | Professional service |
| Line purging | $75 – $150 | If air in lines |
Total immediate cost: $250 – $600+
Potential Damage Costs
| Damage | Cost | When It Happens |
|---|---|---|
| Frozen pipes | $500 – $5,000+ | Winter, house left cold 24+ hours |
| Burst pipes | $2,000 – $10,000+ | Extended cold without heat |
| Water damage | $1,000 – $20,000+ | From burst pipes |
| Appliance damage | $100 – $1,000+ | If pilots don't relight properly |
| Mold growth | $1,000 – $10,000+ | From water damage |
Total potential damage: $500 – $30,000+
Cost Comparison: Prevention vs. Run-Out
| Scenario | Cost |
|---|---|
| Prevention: Remote monitor | $199 – $249 (one-time) + $0/month (Generac 4G LTE) |
| Prevention: Automatic delivery | $0 (most propane companies) |
| Prevention: Weekly gauge check | $0 (just your time) |
| Run-out: Emergency delivery + fees | $250 – $600+ |
| Run-out: Frozen pipes | $500 – $5,000+ |
| Run-out: Burst pipes + water damage | $5,000 – $30,000+ |
Bottom line: Preventing run-outs costs $0 – $250. Running out costs $250 – $30,000+.
Part 4: What To Do If You Run Out of Propane
Immediate Steps
Step 1: Turn Off All Propane Appliances
Turn off furnace at thermostat
Turn off water heater
Turn off stove and oven
Turn off any other propane appliances
Why: Prevents gas from flowing when propane is restored, reduces air in lines
Step 2: Close the Tank Valve
Locate propane tank
Turn valve clockwise to OFF position
Valve is on top of tank
Why: Prevents air from entering lines, safety precaution
Step 3: Call Your Propane Supplier
Request emergency delivery
Tell them your tank is completely empty
Ask about delivery timeframe
Ask about leak check requirement
Important: Most suppliers require a leak check after a run-out before they will restart service.
Step 4: Schedule Leak Check and Restart
Professional will test entire gas system
Purge air from lines
Relight all pilot lights
Test all appliances
Verify safe operation
This is required by law in most jurisdictions after a tank runs empty.
What NOT To Do
| Don't | Why |
|---|---|
| Don't try to relight pilots yourself | Air in lines can cause flashback |
| Don't ignore the problem | Pipes can freeze quickly in winter |
| Don't use alternative heating unsafely | Space heaters can be fire/CO hazards |
| Don't wait to call supplier | Emergency deliveries take longer |
| Don't assume it will be quick | Leak check takes 1-2 hours |
Part 5: Required Safety Procedures After Run-Out
Professional Leak Check
What the technician does:
Pressure test gas lines - Checks for leaks in entire system
Inspect all connections - Verifies no loose fittings
Purge air from lines - Removes air pockets
Relight all pilots - Furnace, water heater, stove, etc.
Test each appliance - Verifies proper operation
Check combustion - Ensures complete burning (no CO)
Verify venting - Confirms proper exhaust
Time required: 1-2 hours
Cost: $75 – $200
Why Leak Checks Are Required
Legal requirement:
Required by NFPA 54 (National Fuel Gas Code)
Required by most state and local codes
Required after any gas interruption
Safety reasons:
Air in lines creates ignition risk
Pilots must be properly relit
Ensures no leaks developed
Verifies safe operation
Your propane supplier may refuse to deliver until a leak check is performed.
Part 6: How to Prevent Running Out of Propane
Method 1: Monitor Your Tank Level Regularly
| Season | Check Frequency |
|---|---|
| Winter | Every 1-2 days |
| Spring/Fall | Weekly |
| Summer | Every 2-4 weeks |
How to check:
Read the gauge on tank (if equipped)
Use remote monitor (best option)
Call propane supplier for level check
Method 2: Install a Remote Tank Monitor ⭐
Best solution for preventing run-outs
| Product | Type | Price | Monthly Fee |
|---|---|---|---|
| Generac 4G LTE | Cellular | $199-249 | $0 ⭐ |
| Mopeka Pro Check | Bluetooth | $65-73 | $0 |
| Mopeka Pro+ Cellular | Cellular | $199.99 | $5-15/mo |
Benefits:
Check tank level from anywhere
Get alerts when tank is low
Never be surprised by empty tank
Track usage patterns
Best option: Generac 4G LTE ($199-249, no monthly fee)
Method 3: Sign Up for Automatic Delivery
How it works:
Propane company estimates your usage
Company schedules deliveries automatically
Tank is filled before it runs out
You don't need to monitor or call
Pros: Hands-off, prevents run-outs Cons: Less control over delivery timing
Cost: Usually free (propane company provides this service)
Method 4: Order Refills Early
When to order propane:
| Tank Level | Season | Action |
|---|---|---|
| 30% | Winter | Order immediately |
| 20% | Spring/Fall | Order soon |
| 30-40% | Before cold snap | Order preventively |
| 20% | Any season | Don't wait - order now |
Rule of thumb: Order when tank reaches 30% in winter, 20% in mild weather.
Method 5: Know Your Usage Rate
Typical propane usage:
| Appliance | Usage per Hour |
|---|---|
| Furnace (100,000 BTU) | ~1 gallon |
| Water heater (40,000 BTU) | ~0.4 gallons |
| Stove/Oven | ~0.2 gallons |
| Generator (7,000W) | ~1.5 gallons |
Average home usage:
| Home Size | Winter Usage (per day) |
|---|---|
| 1,500 sq ft | 5-8 gallons |
| 2,000 sq ft | 8-12 gallons |
| 2,500 sq ft | 12-15 gallons |
Use this to estimate when you'll need a refill.
Part 7: Special Situations
Running Out in Winter
Why it's worse:
House loses heat rapidly
Pipes can freeze within 24-48 hours
Emergency deliveries take longer (high demand)
More expensive (winter pricing)
What to do immediately:
Turn off main water shutoff
Open faucets to drain pipes
Use safe alternative heat (electric space heaters)
Call propane supplier immediately
Consider staying elsewhere if prolonged
Prevention is critical in winter. Don't let tank drop below 30%.
Running Out During Power Outage
What happens:
Generator won't run (no propane)
No backup power
House loses electricity
Well pumps don't work (no water)
Sump pumps don't work (flood risk)
Prevention:
Keep tank at 50%+ during storm season
Monitor tank before storms
Have backup plan (staying elsewhere)
Running Out with Generator
If you rely on propane for backup power:
Empty tank = no generator
Cannot run generator during outage
Lose refrigeration, lights, heat, medical equipment
Prevention:
Keep tank at 50%+ year-round if you have generator
Install remote monitor
Check level before every storm
Part 8: Frequently Asked Questions
Q1: Can I run my propane tank to empty?
A: You should never let your propane tank run completely empty. Running out causes:
Air in gas lines (safety hazard)
Requires professional leak check ($75-200)
Emergency delivery fees ($50-150+)
Potential appliance damage
No heat/hot water in meantime
Always order propane when tank reaches 30% (winter) or 20% (mild weather).
Q2: What happens if my propane tank runs out in winter?
A: Running out in winter is serious:
House loses heat rapidly
Pipes can freeze within 24-48 hours
Frozen pipes can burst ($500-5,000+ damage)
Water damage from burst pipes ($1,000-20,000+)
Emergency delivery takes longer
You may need to leave home
Prevention: Never let tank drop below 30% in winter. Install remote monitor.
Q3: Will my propane company deliver if my tank is empty?
A: Yes, but:
You'll pay emergency delivery fee ($50-150+)
Most companies require leak check before restarting ($75-200)
Delivery may take longer (not immediate)
You may pay higher propane price
It's always cheaper and easier to order before you run out.
Q4: Can I relight my own pilots after running out of propane?
A: NO. After running out:
Air is in gas lines
Air can cause flashback or improper ignition
Professional must purge air and relight pilots
Professional must test for leaks
Required by law in most areas
Never attempt to restart your propane system yourself after a run-out.
Q5: How much does it cost when propane runs out?
A: Total costs can range from $250 to $30,000+:
| Scenario | Cost |
|---|---|
| Minor (warm weather, quick delivery) | $250 – $400 |
| Moderate (winter, leak check required) | $400 – $800 |
| Serious (frozen pipes, no damage) | $500 – $2,000 |
| Major (burst pipes, water damage) | $5,000 – $30,000+ |
Prevention costs $0-250. Run-out costs $250-30,000+.
Q6: How do I know if my propane tank is low?
A: Check these signs:
Gauge reading below 30%
Remote monitor alert (if installed)
Propane company notice (if auto-delivery)
Reduced appliance performance (low pressure)
Frost line low on tank (visual check)
Best method: Install remote monitor (Generac 4G LTE) for constant visibility.
Q7: Can running out of propane damage my furnace or appliances?
A: Yes, potential damage includes:
Pilot light assembly issues
Gas valve problems
Incomplete combustion on restart
Moisture in lines causing corrosion
Soot buildup from improper restart
Professional leak check and restart helps prevent damage.
Q8: How long can a house go without heat before pipes freeze?
A: Depends on temperature:
| Outside Temp | Time Until Pipes Freeze |
|---|---|
| 20-32°F | 24-48 hours |
| 10-20°F | 12-24 hours |
| Below 10°F | 6-12 hours |
Factors: Home insulation, pipe location, interior temperature
If you run out in winter, act immediately to prevent frozen pipes.
Q9: What if I run out and can't get a delivery for days?
A: If delivery is delayed:
Turn off main water shutoff
Open all faucets to drain pipes
Use safe electric heat (space heaters)
Open cabinet doors under sinks
Let faucets drip if you have water
Consider staying elsewhere
Contact multiple propane suppliers if your regular supplier can't deliver quickly.
Q10: Is a remote propane tank monitor worth it?
A: Yes, absolutely. A remote monitor:
Prevents run-outs (saves $250-30,000+)
Costs $65-249 one-time
Generac 4G LTE has no monthly fee
Alerts you before tank is empty
Pays for itself the first time it prevents a run-out
A monitor is one of the best investments you can make for propane safety and convenience.
Conclusion: Prevent Run-Outs Before They Happen
What happens if your propane tank is empty?
❌ No heat, no hot water, no cooking
❌ Safety hazards (air in lines, pilot lights out)
❌ Required professional leak check
❌ Emergency fees ($50-150+)
❌ Potential frozen/burst pipes ($500-30,000+)
Prevention is easy and cheap:
| Method | Cost | Effectiveness |
|---|---|---|
| Remote monitor (Generac 4G LTE) | $199-249 one-time, $0/month | ⭐⭐⭐⭐⭐ Best |
| Automatic delivery | $0 | ⭐⭐⭐⭐ Very good |
| Weekly gauge check | $0 | ⭐⭐⭐ Good |
| Order at 30% | $0 | ⭐⭐⭐ Good |
The bottom line:
Never let your propane tank drop below 30% in winter or 20% in mild weather. Running out is always more expensive, more dangerous, and more inconvenient than preventing it.
Invest in prevention: A $199-249 remote monitor (Generac 4G LTE with no monthly fee) can save you thousands of dollars and keep your family safe and warm.
Last Updated: July 2026
Disclaimer: Costs and procedures vary by location and propane supplier. Always follow your supplier's guidelines and local regulations. Contact your propane supplier for specific policies regarding run-outs and leak checks.
