ThermoMate CZ750NG
#6 in GasFull review
A low cost indoor whole home heater for natural gas homes, but check the warranty with ThermoMate before buying.
Amazon $739.99$739.99
The ThermoMate CZ750NG is the better tankless water heater overall, rated 4.1 to 3.9. The Camplux WA686M costs $180 less ($559.99 vs $739.99).
Camplux WA686M
#11 in GasFull review
A bargain outdoor whole home heater for mild climates, best for buyers comfortable with a short warranty.
Amazon $559.99 Amazon $599.99$559.99
Prices were last checked October 31, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every gas tankless water heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | ThermoMate CZ750NG | Camplux WA686M |
|---|---|---|
| Overall rating | 4.1/5 | 3.9/5 |
| Value 35% | 100 $3.72 per 1,000 BTU/h ($739.99, 199,000 BTU/h) | 100 $2.81 per 1,000 BTU/h ($559.99, 199,000 BTU/h) |
| Heating power 25% | 100 199,000 BTU/h | 100 199,000 BTU/h |
| Efficiency 15% | 6 0.81 UEF | 50 UEF not published (neutral score used) |
| Warranty 25% | 50 heat exchanger warranty not published (neutral score used) | 0 1-year heat exchanger warranty |
Specifications
| ThermoMate CZ750NG | Camplux WA686M | |
|---|---|---|
| Heating | ||
| Fuel | Gas | Gas |
| Gas type | Natural gas | Natural gas or propane |
| Gas input | 199,000 BTU/h | 199,000 BTU/h |
| Max flow | 8 GPM | 8.4 GPM |
| UEF | 0.81 | - |
| Condensing | No | No |
| Installation | ||
| Venting | Indoor | Outdoor |
| Vent type | 3 in OD vent | - |
| Features | ||
| Built-in recirculation | No | No |
| Wi-Fi | No | No |
| Heat exchanger warranty | - | 1 year |
| Parts warranty | - | 1 year |