Thermomate 98 Review: Specs, Pros and Cons
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In this thermomate 98 review, we look at the ThermoMate 98,500 BTU propane tankless water heater. It delivers up to 4 GPM of hot water. This unit is designed for indoor use. It provides instant on-demand heating for one shower and one faucet at the same time. The 98,500 BTU output ensures a 43°F temperature rise. This makes it suitable for everyday household needs. The compact size saves space compared to traditional tanks. We will explain what these specs mean for your daily use.
What stands out
- 98,500 BTU/hr heating power for rapid hot water delivery
- Up to 4 GPM flow rate for simultaneous shower and faucet use
- Temperature stability within ±1°F using advanced sensors
- CSA certification with multiple safety protections including freeze and boil-dry
- Compact dimensions of 21.7" H x 13.8" W x 13.8" D
Who it fits
Good fit for
This heater suits households in moderate climates who need hot water for one shower and one faucet simultaneously. It is ideal for indoor installations where space is limited. The precise temperature control benefits users who want consistent comfort without manual adjustments. If you use propane and need a reliable, compact solution for everyday bathing, this model fits your needs well.
Who should skip it
You should look at another option if you require more than 4 GPM of flow. This unit is for indoor use only, so outdoor installations are not possible. It does not support natural gas directly, as it is propane-only. If you need a unit for multiple bathrooms running at once, this flow rate may be insufficient for your household demands.
Verdict: The ThermoMate 98 offers reliable, compact hot water for single-bathroom households. Its precise temperature control and safety features make it a practical choice for indoor propane setups.
Key specs explained for ThermoMate
98,500 BTU/hr
This input rating determines how much heat the unit generates. Higher BTU allows the heater to raise water temperature more aggressively. It helps maintain flow during cold weather. You should match this to your local groundwater temperature. Units with lower BTU may struggle in winter. This rating ensures consistent performance for standard household demands without excessive energy waste.
Up to 4 GPM
Gallons per minute measures water output volume. A 4 GPM rating supports one shower and one sink simultaneously. It is suitable for small to medium households. Larger families needing multiple concurrent showers might require higher flow models. Check your showerhead flow restrictions. This capacity balances speed and efficiency for typical daily routines without overwhelming gas lines.
Propane
This fuel type requires a propane tank or bulk supply. It is ideal for homes without natural gas lines. Propane delivers consistent pressure and heat. You must ensure proper ventilation and tank storage. It offers flexibility for rural or off-grid locations. Compare this with natural gas models if you have existing gas infrastructure. Propane units often operate efficiently in various climates.
90–140 °F, ±1°F
This range defines adjustable output temperatures. The ±1°F variance indicates high precision control. You can set exact warmth for showers or cleaning. Stable temperature prevents sudden hot or cold shocks. This accuracy is valuable for sensitive skin or specific appliance needs. Compare this with units having wider variances. Precise control enhances comfort and reduces water waste from adjusting knobs repeatedly.
Indoor
This unit is designed for interior installation only. It requires proper venting and air supply. You must follow local building codes for indoor gas appliances. Outdoor models have weatherproofing this unit lacks. Indoor placement protects components from rain and snow. Ensure the space meets clearance requirements. This location option saves exterior wall space but demands careful ventilation planning.
Design and Build Quality
According to the listing, the ThermoMate 98 features a metallic silver finish. The main body is constructed from oxygen-free copper. This material choice targets efficient heat transfer and better corrosion resistance. You get a durable core that handles propane combustion directly. The unit weighs 21.2 pounds. Its dimensions are 21.7 inches in height, 13.8 inches in width, and 13.8 inches in depth. This compact footprint allows it to take up less than one-third the space of traditional tank models. You can mount it on a wall in tight utility areas without crowding the room.
The front panel includes a 3.5-inch LED display. This screen shows water temperature, flow rate, fan speed, and flame status. You adjust settings between 90°F and 140°F using the built-in controls. The display also provides advanced error codes for quick troubleshooting. A UL-certified 120V power cord with a 5-foot length keeps the system powered. You plug this directly into a standard outlet. The layout is straightforward for indoor installation. Standard 3/4-inch NPT water connections and a 1/2-inch NPT gas inlet simplify plumbing work. You do not need complex adapters for most homes.
Setup and Daily Operation
Installation requires standard connections and indoor placement. You need a 3/4-inch NPT water inlet and outlet. The gas line uses a 1/2-inch NPT connection. Venting requires a 3-inch OD pipe. The unit runs on a UL-approved 120V plug. You can plug it into a standard outlet. The compact size measures 21.7 inches high and 13.8 inches wide. This takes up less space than traditional tank models. The LED display is 3.5 inches wide. You use it to set temperatures between 90°F and 140°F. The screen shows flow, fan, and flame status. Error codes help with quick troubleshooting. Daily use relies on precise temperature control. Sensors adjust water flow and gas input continuously. The control chip adjusts heating output 20,000 times per second. This keeps temperature stability within ±1°F. You get consistent hot water even if demand changes. The unit handles inlet temperatures as low as 40°F. It supports one shower and one faucet simultaneously. You can expect a 43°F temperature rise at 4 GPM. Freeze protection activates automatically at 41°F. Safety features include boil-dry and overheat protection. The CSA certification confirms it meets residential standards. You do not need an app for basic operation. The physical display handles all monitoring. The oxygen-free copper heat exchanger ensures efficient heat transfer. You benefit from 98% thermal efficiency. This design reduces energy waste during everyday use.
Before You Buy This Heater
You should verify your gas line capacity before installing this propane unit. The 98,500 BTU input requires a properly sized supply line to maintain the rated 4 GPM flow. Check your local codes for indoor venting requirements, as the 3-inch OD vent must exit safely. You will need a standard electrical outlet for the 120V control board and diagnostic display. Regular maintenance includes checking the copper heat exchanger for mineral buildup, especially if you have hard water. Flush the system annually to preserve the 98% thermal efficiency. Compare this model against the other 1 options on this page. If you need higher flow for multiple bathrooms, consider the 8 GPM variation. If you prefer natural gas, check the NG variants. This unit suits single-bathroom households with moderate water usage. Ensure your inlet water temperature allows for the stated temperature rise. Proper sizing prevents cold showers during winter months.
Check before you buy
- Verify gas line size supports 98,500 BTU input
- Confirm indoor venting meets local building codes
- Check inlet water temperature for desired rise
- Ensure 120V outlet is available nearby
- Compare flow needs against other listed models
The product at a glance
ThermoMate 4 GPM Propane Tankless Water Heater
Best for: Indoor propane households needing single-shower flow
- Fuel Type
- Propane
- Flow Rate
- Up to 4 GPM
- BTU
- 98,500 BTU
- Installation Location
- Indoor
- Voltage
- 120V
- Temperature Control
- 90–140°F, ±1°F
View on Amazon: ThermoMate 4 GPM Propane Tankless Water Heater Affiliate link
The ThermoMate 98,500 BTU propane water heater delivers up to 4 GPM for one shower and one faucet. It features a copper heat exchanger with 98% thermal efficiency and a precise digital display. This indoor unit measures 21.7 inches high and includes multiple safety protections. It suits households needing reliable hot water with stable temperature control.
Pros
- 98,500 BTU/hr output for instant hot water
- Up to 4 GPM flow rate at 43°F rise
- Temperature stability within ±1°F
- 98% thermal efficiency with copper heat exchanger
- Comprehensive safety protections including freeze and boil-dry
Cons
- Indoor installation only
- Propane fuel type limits placement options
- Single shower capacity at high flow
Good fit if
- You need hot water for one shower and one faucet
- You have indoor propane gas access
- You want precise temperature control
Skip if
- You require outdoor installation
- You need simultaneous multi-shower flow
- You prefer natural gas over propane
Verdict: ThermoMate 98,500 BTU Propane Tankless fits homes needing reliable single-point hot water with precise temperature control. It works well for users with indoor propane access who value safety features and energy efficiency.
Specifications side by side
| Spec | ThermoMate 4 GPM Propane Tankless Water Heater |
|---|---|
| Fuel Type | Propane |
| Flow Rate | Up to 4 GPM |
| BTU | 98,500 BTU |
| Installation Location | Indoor |
| Voltage | 120V |
| Temperature Control | 90–140°F, ±1°F |
| Certification | CSA |
| Dimensions | 21 x 13 x 7 in |
| Weight | 21.2 pounds |
| Color | Metallic Silver |
| Model | CZ360LP |
Frequently asked questions
Can I install the ThermoMate 98 outside?
No. This unit is designed strictly for indoor installation. The product data lists the installation location as indoor only. You must place it in a protected area to prevent weather damage. Outdoor use voids the design intent and may cause safety issues.
What fuel type does the Thermomate 98 use?
It uses propane. The specifications confirm the fuel type is propane. You need a propane supply line and proper venting for combustion gases. This unit does not run on natural gas or electricity alone. Ensure your home has access to propane tanks or a bulk supply.
How big is the Thermomate 98 tankless heater?
The unit measures 13.8 inches in width and length, with a height of 21.7 inches. It weighs 21.2 pounds. This compact size allows for placement in small utility spaces. Check your available wall or floor area to ensure it fits your intended installation spot.
Is the Thermomate 98 good for multiple showers?
It is best for single-shower flow. The unit delivers up to 4 GPM, which suits one shower and one faucet. It is not designed for simultaneous high-demand use in multiple bathrooms. You should use it for homes needing reliable single-point hot water rather than whole-house luxury.
What is the model number for the Thermomate 98?
The model number is CZ360LP. This identifier helps you find replacement parts or compatible accessories. Use this specific model code when searching for manuals or technical support. It distinguishes this propane unit from other ThermoMate variants in the product line.
Does the Thermomate 98 require a special plug?
It runs on a standard UL-approved 120V plug. You can plug it into a regular household outlet for power. This powers the controls and ignition system. Do not confuse this electrical need with the gas connection, which requires a separate 1/2-inch NPT line.