ThermoMate CZ360LP 98,500 BTU Propane Tankless Water Heater

What it delivers

The ThermoMate CZ360LP 98,500 BTU Propane Tankless Water Heater is a propane tankless with a 98,500 BTU/h burner and a stated maximum flow of 4.0 GPM. Its listing gives a UEF of 0.81.

Expect about 2.2 GPM with cold winter water (a 70°F rise) and 3.4 GPM when the inlet is milder (45°F rise); that is 1 shower at 2 GPM in January. Size it to your fixtures and climate.

Gas load at full fire: about 1.1 gallons of propane an hour. An older half-inch line that already feeds a furnace often can't spare that, so have a gas fitter check the pipe size and run.

Non-condensing indoor units run hot exhaust and vent in the maker's listed vent system (often stainless Category III), which costs more than plastic.

Listed details: connections: 3/4" npt; material: 4 GPM; model: CZ360LP.

The listing gives dimensions of 13.77 in (W) x 21.65 in (H) and a weight of 21.2 lb.

Right unit for this house?

Install it when

One shower at a time in cold climates
Propane homes
Replacing a gas tank heater

Look at another unit when

More than 1 winter shower at once
Homes without a gas line

Strengths and trade-offs

Strengths

98,500 BTU/h input
Up to 4.0 GPM
UEF 0.81

Trade-offs

Needs a gas line sized for the load
Stainless venting costs more
Needs periodic descaling

Install limits

Figures are the maker's or seller's own. Flow at a rise is our estimate from the input; gas, venting and electrical work needs a licensed professional.

Rated performance

Every figure below comes from the source shown in brackets. Where the maker doesn't state something, we say so instead of estimating.

Model number	CZ360LP	Retailer
Dimensions (seller)	13.77"W x 21.65"H	Retailer
Voltage	120 V	Retailer
Max flow (maker)	4 GPM	Retailer
Input (maker)	98,500 BTU/h	Retailer
Product weight	21.2 lb	Retailer
Material	4 GPM	Retailer
UEF (maker)	0.81	Retailer
Fuel	propane	Retailer
Connections	3/4" npt	Retailer

Rival units at this flow

Orbek HW100 100,000 BTU Propane Tankless Water Heater100,000 BTU/h, up to 4.3 GPM.

VEVOR JSQ30-B 100,000 BTU Propane Tankless Water Heater100,000 BTU/h.

APUS AP-AWH-Q13LPG 95,000 BTU Propane Tankless Water Heater95,000 BTU/h, up to 4.4 GPM.

More gas tankless water heaters rated for similar demand

Full gas tankless water heaters spec grid · Every ThermoMate unit in the catalog

Final verdict

A well-specified propane tankless for one shower at a time in cold climates.

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Questions buyers ask

How many showers can the ThermoMate CZ360LP 98,500 BTU Propane Tankless Water Heater run at once?

From its 98,500 BTU/h input we estimate about 3.4 GPM at a 45°F rise and 2.2 GPM at a 70°F rise, so 1 two-GPM shower with mild inlet water and 1 in a cold winter. The maker's flow chart for this model is the final word.

What size gas line does the ThermoMate CZ360LP 98,500 BTU Propane Tankless Water Heater need?

At full fire it uses about 95 cubic feet of natural gas an hour or 1.1 gallons of propane. The pipe size depends on the length of the run and every other gas appliance on it; the maker's manual and a licensed gas fitter decide it.