Capacity Sensor for Buried Propane Tank: Complete Installation, Monitoring & Selection Guide for 2026
In this guide: Everything you need to know about capacity sensors for buried propane tanks - covering how buried tank monitoring works, the best sensors and technologies available in 2026, dome riser installation methods, cellular vs. BLE connectivity options, accuracy considerations for underground tanks, supplier integration options, and the complete FAQ guide.
Capacity Sensor for Buried Propane Tank: Quick Answer
A capacity sensor for a buried propane tank is a specialized level monitoring device designed to measure how much propane remains in an underground storage tank - where the tank body is completely inaccessible underground and only the dome riser and service valves protrude above ground. Unlike standard above-ground tank sensors that mount directly on the tank body, buried tank sensors must measure through the dome riser pipe, use cellular or long-range BLE connectivity (since WiFi rarely reaches underground locations), and be designed for the unique thermal and environmental conditions of underground installation. The best capacity sensors for buried propane tanks in 2026 are the Generac G0070090 LTE (best cellular option, no WiFi needed, $199–$249), the Otodata Leap LTE (best for supplier programs, cellular direct-connect), the Mopeka Pro Check with dome riser bracket (best for smart home users who have WiFi at the riser location), and ESPhome DIY ultrasonic sensors (best for budget-conscious users with some technical skill). The key installation challenge: the sensor must be mounted inside or on the dome riser pipe above ground, not on the underground tank body - which requires the correct dome riser bracket and proper positioning to achieve accurate readings.
How Buried Propane Tank Monitoring Works
Understanding the Underground Installation Challenge
Buried propane tanks present unique monitoring challenges that above-ground tank sensors are not designed to solve. Understanding these challenges is essential before selecting a capacity sensor for your buried tank.
Why standard sensors do not work on buried tanks: Standard propane tank level sensors - including Mopeka sensors with their magnetic mounts and ultrasonic measurement technology - are designed to mount on the exterior of an accessible steel tank body. On a buried tank, the tank body is underground and completely inaccessible. The only above-ground access point is the dome riser - a vertical pipe (typically 4–6 inches in diameter) that extends from the tank's service valve above ground, usually 6–18 inches above the soil surface. The dome riser provides access to the tank's internal components (service valve, relief valve, fill valve) and is the only location where a level sensor can be installed.
The dome riser measurement principle: Buried tank capacity sensors work by measuring the propane level from inside the dome riser column. Since the dome riser pipe connects directly to the tank's internal vapor space, the liquid propane level inside the riser is the same as the liquid level inside the tank. The sensor measures the distance from its position inside the riser to the liquid surface below, then calculates the tank's fill percentage based on the known tank dimensions. This is the same ultrasonic principle used by above-ground sensors - but adapted for installation inside a vertical pipe rather than on the exterior of a horizontal tank.
Buried tank sensor installation requirements:
| Requirement | Detail | Why It Matters |
|---|---|---|
| Dome riser access | Standard 4–6" diameter dome riser | Sensor must fit inside the riser pipe |
| Above-ground placement | Sensor is fully above ground | No excavation required for installation |
| Cellular or long-range connectivity | LTE or extended BLE required | WiFi rarely reaches underground tank locations |
| Temperature-rated components | Operating range: -40°F to 140°F | Underground tanks have unique thermal profiles |
| Waterproof enclosure | IP67 or higher | Sensor exposed to rain, snow, irrigation |
| Dome riser bracket | Tank-specific mounting hardware | Required for secure, stable sensor placement |
Best Capacity Sensors for Buried Propane Tanks in 2026
Reviews and Recommendations
1. Generac G0070090 LTE - Best Cellular Option for Buried Tanks
The Generac G0070090 is the best capacity sensor for buried propane tanks that do not have reliable WiFi at the dome riser location. Its built-in LTE cellular connectivity means it transmits data directly to Generac's cloud servers - no WiFi, no hub, and no range limitations - making it ideal for buried tanks in remote locations, rural properties, and areas where WiFi does not reach the tank area.
The G0070090 mounts on the dome riser using a compatible dome riser bracket (available from Generac or your propane supplier), and the cellular antenna extends above the riser for reliable signal reception. The monitor uses ultrasonic measurement technology and sends level data to the Mobile Link app every 15 minutes. There is no monthly subscription fee - the cellular data is included in the purchase price.
Key specifications for buried tank use:
| Specification | Detail | Buried Tank Relevance |
|---|---|---|
| Price | $199–$249 | No additional hub cost |
| Connectivity | LTE Cellular (AT&T/T-Mobile) | Works anywhere with cellular signal |
| Mounting | Dome riser bracket | Designed for buried tank installation |
| Measurement | Ultrasonic | Same principle as above-ground sensors |
| Battery | 4× AA lithium, 5+ year life | Excellent for underground (hard to access) |
| No hub required | Yes | Eliminates WiFi dependency |
| Smart home | Alexa direct; limited HA | OK for basic monitoring |
| Waterproof | IP67 | Resistant to weather and irrigation |
| Temperature range | -40°F to 140°F | Handles underground thermal conditions |
2. Otodata Leap LTE - Best for Supplier Program Users
The Otodata Leap is Otodata's flagship cellular propane monitor, designed specifically for buried and above-ground steel propane tanks. It is the preferred choice for homeowners enrolled in propane supplier monitoring programs - particularly through suppliers that partner with Otodata for automated delivery scheduling.
The Otodata Leap uses LTE cellular connectivity to transmit tank level data to the Otodata cloud platform, which is accessible through the Otodata app and integrated into the supplier's delivery management system. For buried tank users, Otodata offers dome riser mounting hardware and installation guides specific to underground tank configurations. The Leap has no mandatory subscription - hardware is available for purchase directly, and many supplier programs include the hardware as part of a monitoring service agreement.
Key specifications for buried tank use:
| Specification | Detail | Buried Tank Relevance |
|---|---|---|
| Price | $149–$249 (varies by supplier) | Supplier programs may include free hardware |
| Connectivity | LTE Cellular | No WiFi required at buried tank location |
| Mounting | Dome riser bracket, magnetic | Compatible with buried tank configurations |
| Battery life | 5+ years | Ideal for underground (minimal maintenance) |
| Data access | Otodata app + supplier dashboard | Shared with your propane supplier |
| Supplier integration | Built-in (for enrolled customers) | Automated refill scheduling |
3. Mopeka Pro Check with Dome Riser Bracket - Best for Home Assistant Users
The Mopeka Pro Check with a dome riser mounting bracket is the best choice for buried tank users who want to integrate their tank monitoring into a Home Assistant smart home system and have WiFi available at the dome riser location.
The Mopeka Pro Check is the most accurate consumer propane sensor available (±3–5%), works on both steel and plastic tanks, and integrates natively with Home Assistant via MQTT. The Mopeka Hub (required) connects to your home WiFi network, which must reach the dome riser location. For buried tanks where WiFi signal is weak or unreliable at the riser, use an ESP32 BLE proxy (Script 2 from the Otodata/Nee-Vo script guide) placed near the riser to extend BLE range and bridge to WiFi.
Key specifications for buried tank use:
| Specification | Detail | Buried Tank Relevance |
|---|---|---|
| Price | $40–$60 sensor + $49–$69 Hub | Total $89–$129 |
| Connectivity | BLE → Hub → WiFi | WiFi must reach dome riser or use BLE proxy |
| Mounting | Dome riser bracket (sold separately) | Required for buried tank installation |
| Measurement accuracy | ±3–5% | Best accuracy of any buried tank option |
| Tank compatibility | Steel, plastic, fiberglass, aluminum | Works regardless of tank material |
| Smart home | Full Home Assistant MQTT integration | Best for smart home enthusiasts |
| AI predictions | Free Co-Pilot features | Predictive refill alerts |
| Local data | Via Home Assistant (100% local possible) | Maximum data ownership |
4. ESPhome DIY Ultrasonic Sensor - Best Budget Option
For buried tank users with technical skills, an ESPhome DIY ultrasonic sensor with a dome riser installation costs $20–$50 total - a fraction of the price of commercial options - while delivering full Home Assistant integration and 100% local data control.
The ESPhome build for a buried tank is similar to the standard ESPhome propane sensor (see the Otodata/Nee-Vo scripting guide), but the mounting and enclosure are adapted for dome riser installation. The sensor is enclosed in a waterproof IP67 box mounted above the riser, with the ultrasonic transducer pointed down into the riser pipe toward the liquid surface below.
ESPhome components for buried tank:
| Component | Product | Price | Purpose |
|---|---|---|---|
| Microcontroller | ESP32-WROOM-32 | $5–$10 | BLE broadcast + ultrasonic control |
| Ultrasonic sensor | JSN-SR04T (waterproof) | $5–$10 | Measures liquid level inside dome riser |
| Enclosure | IP67 waterproof junction box | $5–$10 | Weatherproof housing above riser |
| Power | USB 5V adapter or solar + USB | $5–$15 | Powers ESP32 |
| Optional LTE module | SIM800L SIM800C | $10–$15 | For locations without WiFi |
| Total cost | $20–$50 | Complete DIY buried tank sensor |
Complete Installation Guide for Buried Propane Tanks
Dome Riser Sensor Installation Step by Step
Installing a capacity sensor on a buried propane tank requires working with the dome riser - the above-ground access point that connects to the tank below. Here is the complete installation process:
Step 1 - Identify your dome riser: Locate the dome riser pipe on your buried tank. It is typically a 4–6 inch diameter vertical pipe extending 6–18 inches above ground level, usually located at one end of the tank. The dome riser contains the service valve (for regulator connection), the relief valve (pressure safety), and the fill valve (for refilling). Never attempt to open or modify any valve on the dome riser - the tank is pressurized and working near the riser requires caution.
Step 2 - Verify the dome riser is clear: Ensure the interior of the dome riser pipe is clear of debris, water, or ice. Inspect the inside of the pipe - you should be able to see down several feet toward the tank. If there is standing water in the riser, contact your propane supplier before proceeding - water in the riser indicates a potential leak or seal issue that requires professional attention.
Step 3 - Install the dome riser bracket: For Mopeka Pro Check and ESPhome DIY installations, attach the dome riser mounting bracket to the rim of the dome riser pipe. The bracket should sit securely on the top rim of the pipe without obstructing the valves or service connections. Secure with the provided hardware - typically screws or adjustable clamps that fit standard 4–6 inch dome riser diameters.
Step 4 - Mount the sensor: Attach the sensor to the bracket with the ultrasonic transducer pointing downward into the dome riser pipe. The transducer should be centered over the pipe opening, pointing directly at the liquid surface below. For the Generac G0070090 and Otodata Leap, the sensor body and antenna mount directly on or adjacent to the dome riser bracket per the manufacturer's instructions.
Step 5 - Connect power and activate: Connect power (battery or USB) and activate the sensor per the manufacturer's instructions. The sensor will begin taking measurements and transmitting data within 1–5 minutes of activation.
Step 6 - Verify the reading: Open the app (Mobile Link for Generac, Otodata app, or Mopeka app) and verify the sensor displays a tank level reading. A reading of 80–100% immediately after a recent fill indicates correct installation. A reading of "–" or "No reading" indicates the sensor is not correctly positioned in the dome riser - reposition and retry.
Connectivity Solutions for Buried Tank Locations
Solving the WiFi Problem
The most common challenge for buried propane tank monitoring is connectivity - WiFi routers rarely reach underground tank locations that may be 50–200+ feet from the house. Here are the solutions:
| Solution | When to Use | Cost | Setup Complexity |
|---|---|---|---|
| Cellular LTE monitor (Generac/Otodata) | No WiFi at riser location | $199–$249 | Low |
| WiFi range extender | WiFi almost reaches riser | $30–$60 | Low |
| ESP32 BLE proxy + WiFi | Mopeka/BLE sensor, weak WiFi | $8–$15 | Medium |
| ESP32 + LTE module (SIM800L) | ESPhome DIY, no WiFi | $10–$15 added | High |
| Mesh WiFi nodes | Good WiFi at house, weak at tank | $100–$300 | Medium |
Buried Tank Capacity Sensor Comparison
All Options Head-to-Head
| Feature | Generac G0070090 LTE | Otodata Leap LTE | Mopeka Pro Check + Hub | ESPhome DIY |
|---|---|---|---|---|
| Price | $199–$249 | $149–$249 | $89–$129 | $20–$50 |
| Connectivity | LTE Cellular | LTE Cellular | BLE → Hub → WiFi | BLE/WiFi/LTE |
| WiFi required | ❌ No | ❌ No | ✅ Yes (via Hub) | ⚠️ Optional |
| Dome riser compatible | ✅ Yes | ✅ Yes | ✅ Yes (bracket) | ✅ Yes |
| Accuracy | ±5–8% | ±5–8% | ±3–5% | ±5–10% |
| No subscription | ✅ Yes | ✅ Yes | ✅ Yes | ✅ Yes |
| Home Assistant | ⚠️ Limited | ⚠️ Limited | ✅ Full (MQTT) | ✅ Full (local) |
| Supplier automation | ⚠️ Some programs | ✅ Built-in | ❌ None | ❌ None |
| Battery life | 5+ years | 5+ years | 2–3 years | 6–12 months (LiPo) |
| Setup complexity | Low | Low | Medium | High |
| DIY/customizable | ❌ No | ❌ No | ⚠️ Limited | ✅ Fully |
Frequently Asked Questions
Q1: Can I use a standard above-ground propane sensor on a buried tank?
No - standard above-ground propane sensors (including the standard Mopeka magnetic mount) are designed to mount on the exterior of an accessible tank body, not inside a dome riser pipe. Attempting to use a standard sensor on a buried tank would require excavating the tank to access the body, which is unnecessary and potentially dangerous. The correct approach for buried tanks is a dome riser sensor - either a commercial product designed for dome riser installation (Generac G0070090, Otodata Leap, or Mopeka with a dome riser bracket) or a DIY build mounted inside the riser pipe. Some suppliers and installers offer custom dome riser extensions that bring the measurement point closer to ground level for easier sensor access - ask your propane supplier about dome riser options for your specific buried tank.
Q2: How accurate is a buried tank capacity sensor?
Buried tank capacity sensors achieve ±5–8% accuracy for cellular monitors (Generac, Otodata) and ±3–5% for the Mopeka Pro Check. The accuracy is slightly lower than some above-ground sensors because the measurement path through the dome riser pipe can introduce minor variations in the ultrasonic echo. The dome riser pipe's interior surface, any condensation, and the distance from the sensor to the liquid surface all contribute to a small accuracy margin. However, ±5–8% accuracy is more than sufficient for refill management - the sensor tells you when to schedule a refill, and the exact gallon measurement is not critical for residential or commercial use. The key to maximizing accuracy on a buried tank is correct dome riser bracket positioning: the sensor must be centered over the riser pipe opening, pointing directly downward toward the liquid surface, without obstruction from the riser walls.
Q3: How do I know if my buried tank has a dome riser?
Most buried propane tanks in North America have dome risers, but the design varies. A standard residential buried propane tank (250–1,000 gallons) typically has a single dome riser at one end of the tank, extending 6–18 inches above ground level. Some older tanks or smaller residential tanks may have a flush-mounted riser (barely visible above ground) or may not have a riser at all - in these cases, contact your propane supplier before purchasing a buried tank sensor. Commercial and agricultural buried tanks (1,000–30,000 gallons) may have multiple dome risers or a larger diameter riser system. Always confirm your dome riser diameter (typically 4–6 inches) and condition (clear of debris, structurally sound) before installing a sensor.
Q4: Can I install a buried tank sensor without professional help?
Yes - installing a capacity sensor on a buried propane tank is a non-invasive process that does not require excavation, tank modification, or work on pressurized components. The sensor installs entirely above ground, mounting on or inside the dome riser pipe. However, always notify your propane supplier before working near your buried tank - they can confirm the tank is safe to work around, verify the dome riser is in good condition, and may have specific installation requirements. Never attempt to open, remove, or modify any valve, fitting, or component on the dome riser - this work should only be done by a licensed propane technician. If your dome riser shows signs of damage, corrosion, or water intrusion, contact your supplier for professional inspection before installing a sensor.
Q5: What happens to buried tank monitoring during winter and freezing conditions?
Buried tanks are actually more thermally stable than above-ground tanks during winter - the surrounding soil insulates the tank and prevents the extreme temperature swings that affect above-ground tanks. The propane inside a buried tank stays warmer in cold weather, maintaining better vapor pressure and appliance performance. However, the dome riser and above-ground components are exposed to freezing conditions. Ensure the sensor and dome riser bracket are rated to your local minimum temperature (all recommended sensors handle -40°F). If your area experiences ice accumulation in the dome riser, carefully remove ice from the riser opening without forcing objects into the pipe. The sensor itself (Generac, Otodata, Mopeka) is fully rated for outdoor winter operation - the main concern is ice blocking the riser opening, which can affect sensor readings and must be cleared carefully.
The Bottom Line
A capacity sensor for a buried propane tank is a specialized but well-established technology - the installation challenge is solved, the connectivity challenge is solved with cellular options, and the accuracy is sufficient for all residential and commercial monitoring needs. For buried tank users who want the simplest solution with no WiFi dependency, the Generac G0070090 LTE ($199–$249) is the best choice - it mounts on the dome riser, transmits directly over cellular, and has a 5+ year battery with no subscription fee. For buried tank users enrolled in a propane supplier program that uses Otodata, the Otodata Leap delivers the same functionality with built-in supplier automation. For Home Assistant users who want full data ownership and automation scripting, the Mopeka Pro Check with dome riser bracket is the most accurate and most customizable option. For budget-conscious users with some technical skill, an ESPhome DIY build ($20–$50) delivers a functional buried tank sensor with full Home Assistant integration. The key installation step that makes or breaks accuracy on a buried tank is correct dome riser bracket positioning - take the time to center the sensor over the riser opening and verify the initial reading against your last fill receipt. Once installed correctly, a buried tank capacity sensor eliminates the uncertainty of underground propane management - giving you the same visibility and peace of mind that above-ground tank users have always had, from anywhere in the world.
Last updated: July 2026
Disclaimer: This guide provides general information about capacity sensors for buried propane tanks for educational and purchasing guidance purposes. Specific product availability, pricing, dome riser compatibility, and installation requirements vary by tank model, supplier, and region. Buried propane tanks are pressurized vessels containing flammable gas - always follow manufacturer safety instructions and consult your propane supplier before working near or installing equipment on a buried tank. Never modify, open, or attempt to service any component of a buried propane tank system without professional certification. Dome riser inspection and sensor installation should be performed by or in consultation with a licensed propane technician. This guide is not affiliated with, endorsed by, or sponsored by Generac, Otodata, Mopeka, ESPhome, or any other referenced company or project.
