ThermoMate CZ360NG 98,500 BTU Natural Gas Tankless Water Heater

What it delivers

The ThermoMate CZ360NG 98,500 BTU Natural Gas Tankless Water Heater is a non-condensing gas 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.

Worked out from its input, it delivers roughly 3.4 GPM when the water only has to rise 45°F, and 2.2 GPM at a 70°F winter rise: 1 shower at 2 GPM in summer, 1 shower at 2 GPM in winter. Size it to your fixtures and climate.

The line must deliver about 95 cubic feet of natural gas an hour when it fires flat out. The requirement calculator adds it up; a licensed fitter confirms the pipe.

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.

Other listed details: connections: 3/4" npt; material: 4 GPM; model: CZ360NG.

The listing gives dimensions of 13 in (W) x 21 in (H).

Right unit for this house?

Install it when

One shower at a time in cold climates
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	CZ360NG	Retailer
Dimensions (seller)	13"W x 21"H	Retailer
Features (seller)	Advanced Flow Regulation, Smart Diagnostic Display, Multiple Safety Protections, High Energy Efficiency Advanced Flow Regulation, Smart Diagnostic Display, Multiple Safety Protections, High Energy Efficiency	Retailer
Material	4 GPM	Retailer
Input (maker)	98,500 BTU/h	Retailer
Max flow (maker)	4	Retailer
Voltage	120v	Retailer
UEF (maker)	0.81	Retailer
Fuel	natural gas	Retailer
Connections	3/4" npt	Retailer

Rival units at this flow

GASLAND CG360NG 98,500 BTU Natural Gas Tankless Water Heater98,500 BTU/h, up to 4.0 GPM.

Ranein RH10K 100,000 BTU Natural Gas Tankless Water Heater100,000 BTU/h, up to 4.3 GPM.

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

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 sensible non-condensing gas tankless for one shower at a time in cold climates.

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Questions buyers ask

How many showers can the ThermoMate CZ360NG 98,500 BTU Natural Gas 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 CZ360NG 98,500 BTU Natural Gas Tankless Water Heater need?

At full fire it uses about 95 cubic feet of natural gas an hour. 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.