Rinnai EnergySaver EX17DTN
#3 in Direct ventFull review
For a large room or small home zone that needs steady, thermostat controlled heat. The EX22DTN is worth the small step up if the space is borderline.
Amazon $2,005.92$2,005.92
The Rinnai EnergySaver EX17DTN is the better gas wall heater overall, rated 3.7 to 2.2. The Rinnai EnergySaver EX17DTN leads on warranty, controls and heat output. The Williams 1403822 Direct Vent Furnace wins on value. The Williams 1403822 Direct Vent Furnace costs $1,016.92 less ($989 vs $2,005.92).
Williams 1403822 Direct Vent Furnace
#13 in Direct ventFull review
For a small room or cabin on natural gas that needs heat through outages at the lowest price. Add the wall thermostat and expect higher gas bills than a sealed electronic unit.
Amazon $989$989
Prices were last checked November 2, 2026 and are subject to change; the price and availability shown by the retailer at the time of purchase apply.
Which should you buy?
- Choose the Rinnai EnergySaver EX17DTN for warranty (5-year warranty vs 1-year warranty), controls (thermostat, blower, electronic ignition vs manual control, push button ignition) and heat output (16,700 BTU/hr vs 14,000 BTU/hr).
- Choose the Williams 1403822 Direct Vent Furnace for value ($70.64 per 1,000 BTU ($989, 14,000 BTU) vs $120.11 per 1,000 BTU ($2,005.92, 16,700 BTU)).
Scores side by side
Each factor is scored 0-100 against the same fixed reference points for every direct vent gas wall heater; a clear win is highlighted. How we rank explains each one.
| Factor weight | Rinnai EnergySaver EX17DTN | Williams 1403822 Direct Vent Furnace |
|---|---|---|
| Overall rating | 3.7/5 | 2.2/5 |
| Value 30% | 35 $120.11 per 1,000 BTU ($2,005.92, 16,700 BTU) | 60 $70.64 per 1,000 BTU ($989, 14,000 BTU) |
| Heat output 15% | 22 16,700 BTU/hr | 13 14,000 BTU/hr |
| Controls 20% | 100 thermostat, blower, electronic ignition | 0 manual control, push button ignition |
| Fuel 5% | 0 natural gas only | 0 natural gas only |
| Warranty 30% | 100 5-year warranty | 0 1-year warranty |
Specifications
| Rinnai EnergySaver EX17DTN | Williams 1403822 Direct Vent Furnace | |
|---|---|---|
| Heat | ||
| Venting | Direct vent | Direct vent |
| Heat type | Furnace | Furnace |
| Maximum input | 16,700 BTU/hr | 14,000 BTU/hr |
| Minimum input | 8,200 BTU/hr | - |
| Efficiency | 81% AFUE | 65% AFUE |
| Fuel and controls | ||
| Fuel | Natural gas | Natural gas |
| Thermostat | Yes | No |
| Blower | Yes | No |
| Ignition | Electronic (120 V) | Push button |
| Needs an outlet | Yes | No |
| Build | ||
| Weight | 51 lb | - |
| Warranty | 5 years | 1 year |