Hargassner GmbH SMART HV23
Hargassner GmbH SMART HV23 is a non-catalytic hydronic heater from Hargassner GmbH with 73% HHV efficiency and a 10,166–78,335 BTU/h output range.
| Appliance type | hydronic-heater |
|---|---|
| Combustion technology | Non-Catalytic Stove |
| Certified fuel | Cord Wood |
| Covered model numbers | SMART HV23 |
| Efficiency (HHV) | 73 % |
|---|
| Heat output (low) | 10166 BTU/h |
|---|---|
| Heat output (high) | 78335 BTU/h |
| Firebox volume | 3.53 cu ft |
| Carbon monoxide | 1.632 g/min |
|---|
| 25C tax credit eligible (≥75% HHV) | No |
|---|---|
| 2020 NSPS compliant | Yes |
| Currently in production | Yes |
| EPA certification number | 54HH-24 |
What space does the Hargassner GmbH SMART HV23 suit?
- The 3.53 cu ft firebox puts it in the large-home, overnight-burn class.
- Certified burning Cord Wood — the test fuel closest to real-world firewood.
Similar hydronic heaters
- LMF Manufacturing AHB-170P
- Fröling Heizkessel und Behälterbau Ges.m.b.H S3 Turbo 50
- Värmebaronen AB/Smokeless Heat Pellmax 200 UB
- Windhager Zentralheizung Technik GmbH BioWIN 212
- Effecta Energy Solutions Komplett III LIGHT 25 KW
- Tarm USA, Inc./ Fröling Heizkessel- und Behälterbau Ges.m.b.H P4 Unit 25
Frequently asked questions
Is the Hargassner GmbH SMART HV23 EPA certified?
Yes, the Hargassner GmbH SMART HV23 is on the EPA's current list of certified wood heaters (certification number 54HH-24) and meets the 2020 NSPS Step 2 emission limits.
Does the Hargassner GmbH SMART HV23 qualify for a federal tax credit?
No — the federal 25C credit for biomass stoves was terminated for property placed in service after December 31, 2025. The Hargassner GmbH SMART HV23's certified efficiency is 73% HHV, which did not meet the credit's ≥75% HHV threshold while it existed. State and local incentive programs may still apply — check your state energy office and air district.
Sources
- cfpub.epa.gov (retrieved 2026-07-23)