The Rinnai EnergySaver EX08DTN rates 3.4 among direct vent gas wall heaters; the ProCom MN100TBA-B 10K Blue Flame rates 2.3 among vent-free ones. The ProCom MN100TBA-B 10K Blue Flame costs $1,272.16 less ($129.59 vs $1,401.75).
For a bedroom, office or small addition where steady, quiet, thermostat controlled heat matters more than purchase price. Skip it if you need heat through power outages.
Amazon $1,401.75A cheap thermostat controlled heater for one small natural gas room or office. Buy it when you want hands-off warmth and do not need much output.
Amazon $129.59Prices 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.
These two sit in different venting classes (direct vent and vent-free), and each is scored against the reference points for its own class, so a rating says how well each does among its own venting peers. How we rank explains each factor.
| Factor weight | Rinnai EnergySaver EX08DTN | ProCom MN100TBA-B 10K Blue Flame |
|---|---|---|
| Overall rating | 3.4/5 | 2.3/5 |
| Value 30% | 17 $175.22 per 1,000 BTU ($1,401.75, 8,000 BTU) | 46 $12.96 per 1,000 BTU ($129.59, 10,000 BTU) |
| Heat output 15% | 0 8,000 BTU/hr | 0 10,000 BTU/hr |
| Controls 20% | 100 thermostat, blower, electronic ignition | 50 thermostat |
| Fuel 5% | 0 natural gas only | 0 natural gas only |
| Warranty 30% | 100 5-year warranty | 0 1-year warranty |
| Rinnai EnergySaver EX08DTN | ProCom MN100TBA-B 10K Blue Flame | |
|---|---|---|
| Heat | ||
| Venting | Direct vent | Vent-free |
| Heat type | Furnace | Blue flame |
| Maximum input | 8,000 BTU/hr | 10,000 BTU/hr |
| Minimum input | 3,000 BTU/hr | - |
| Heating area claim | - | 500 sq ft |
| Efficiency | 82% AFUE | - |
| Fuel and controls | ||
| Fuel | Natural gas | Natural gas |
| Thermostat | Yes | Yes |
| Blower | Yes | No |
| Ignition | Electronic (120 V) | Push button |
| Needs an outlet | Yes | No |
| Oxygen depletion sensor | - | Yes |
| Build | ||
| Weight | 42 lb | 14 lb |
| Warranty | 5 years | 1 year |
