What it delivers
The ThermoMate CZ264NGCA 75,000 BTU Natural Gas Tankless Water Heater is a non-condensing gas tankless with a 75,000 BTU/h burner. Its listing gives a UEF of 0.81.
Expect about 1.6 GPM with cold winter water (a 70°F rise) and 2.6 GPM when the inlet is milder (45°F rise); that is less than one 2 GPM shower in January. Check it against your own fixtures.
At full fire it burns about 72 cubic feet of natural gas an hour. The gas line has to carry that on top of the furnace, range and dryer; a gas fitter sizes the pipe from its length and the total load.
Its exhaust runs hot, so the vent must be the material its manual lists, usually stainless; budget for the vent kit.
Listed details: connections: 3/4" npt; model: CZ264NGCA.
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
- 75,000 BTU/h input
- UEF 0.81
Trade-offs
- Needs a gas line sized for the load
- Stainless venting costs more
- Annual flushing on hard water
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 | CZ264NGCA | Retailer |
|---|---|---|
| Voltage | 120 V AC | Retailer |
| Input (maker) | 75,000 BTU/h | Retailer |
| UEF (maker) | 0.81 | Retailer |
| Fuel | natural gas | Retailer |
| Connections | 3/4" npt | Retailer |
Rival units at this flow
More gas tankless water heaters rated for similar demand
- RIWORY RWRHT008 85,000 BTU Natural Gas Tankless Water Heater
- GASLAND CG360NG 98,500 BTU Natural Gas Tankless Water Heater
- APUS AP-AWH-Q13NG 95,000 BTU Natural Gas Tankless Water Heater
- Rinnai V53DeN Natural Gas Tankless Water Heater
Full gas tankless water heaters spec grid · Every ThermoMate unit in the catalog
Final verdict
A well-specified non-condensing gas tankless for one shower at a time in cold climates.
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