waterheaterspecs

Solar water heaters

The solar group holds 28 certified model numbers in 27 rating sets, from 11 brands. Collector areas run from 22.3 sq ft to 82 sq ft, the largest on Rheem RS80-48BP. By system type: 11 indirect forced circulation, 7 direct thermosyphon, 5 direct ICS (integral collector-storage, with batch collectors), 3 direct forced circulation and 2 indirect thermosyphon. A backup tank pairs with 19 systems and a tankless backup with 9.

Certified models as of October 27, 2026 · Open this type in the Heater finder

Solar UEF as listed, against collector area

Tank backupTankless backup

Solar UEF

Solar UEF as listed, against collector area051015202520304050607080Collector area, sq ftAET B-DBS-G2-80-64AET DX-120-64AET DX-80-40AET FF-80-42Dimas 300-3 ELGREENoneTEC Double EGREENoneTEC Double GTGREENoneTEC HEGREENoneTEC L-ExtraGREENoneTEC L-GTHeliodyne HF 1 406 G 40 AC S EHeliodyne HF 1 408 G 60 AC S EHeliodyne HF 1 410 G 80 AC S EMC Green B80-20Rheem RS120-64BP-TGRheem RS80-40BPRheem RS80-40BP-TGRheem RS80-48BPSammler A169Sammler US200-25Sammler US200-42Solahart ASE 302JSunEarth C2-26T-40-TLGSunEarth C2-40T-50-TLGTychon FPS/HP 300Universal Solar Products C80-18Universal Solar Products D120-18
Solar UEF as listed, against collector area051015202520406080Collector area, sq ftAET B-DBS-G2-80-64AET DX-120-64AET DX-80-40AET FF-80-42Dimas 300-3 ELGREENoneTEC Double EGREENoneTEC Double GTGREENoneTEC HEGREENoneTEC L-ExtraGREENoneTEC L-GTHeliodyne HF 1 406 G 40 AC S EHeliodyne HF 1 408 G 60 AC S EHeliodyne HF 1 410 G 80 AC S EMC Green B80-20Rheem RS120-64BP-TGRheem RS80-40BPRheem RS80-40BP-TGRheem RS80-48BPSammler A169Sammler US200-25Sammler US200-42Solahart ASE 302JSunEarth C2-26T-40-TLGSunEarth C2-40T-50-TLGTychon FPS/HP 300Universal Solar Products C80-18Universal Solar Products D120-18
Each circle is one system. Solar UEF (SUEF) values are the SRCC OG-300 ratings as reported in the ENERGY STAR dataset; values of 50 or more were removed as placeholders (see Method).

Every rating set

Grouped by backup fuel.

Solar rating sets
Rating setSolar UEFCollector areaCollectorSystem typeBackup
Solar, electric backup17 sets
AET DX-120-64
Show 1 model number
  • AET DX-120-64
5.865.3 sq ftFlat PlateIndirect Forced Circulationtank
AET DX-80-40
Show 1 model number
  • AET DX-80-40
3.540.6 sq ftFlat PlateIndirect Forced Circulationtank
AET FF-80-42
Show 1 model number
  • AET FF-80-42
6.743 sq ftFlat PlateDirect Thermosyphontank
Dimas 300-3 EL
Show 1 model number
  • Dimas 300-3 EL
12.131.5 sq ftFlat PlateDirect Thermosyphontank
GREENoneTEC Double E
Show 1 model number
  • GREENoneTEC Double E
3.344.6 sq ftBatchDirect ICStank
GREENoneTEC HE
Show 1 model number
  • GREENoneTEC HE
1122.3 sq ftBatchDirect ICStank
GREENoneTEC L-Extra
Show 1 model number
  • GREENoneTEC L-Extra
3.325.7 sq ftBatchDirect ICStank
Heliodyne HF 1 406 G 40 AC S E
Show 1 model number
  • Heliodyne HF 1 406 G 40 AC S E
3.327 sq ftFlat PlateDirect Forced Circulationtank
Heliodyne HF 1 408 G 60 AC S E
Show 1 model number
  • Heliodyne HF 1 408 G 60 AC S E
10.732.2 sq ftFlat PlateDirect Forced Circulationtank
Heliodyne HF 1 410 G 80 AC S E
Show 1 model number
  • Heliodyne HF 1 410 G 80 AC S E
6.640.3 sq ftFlat PlateDirect Forced Circulationtank
MC Green B80-20
Show 1 model number
  • MC Green B80-20
23.336.2 sq ftFlat PlateDirect Thermosyphontank
Rheem RS80-40BP
Show 1 model number
  • Rheem RS80-40BP
4.824.7 sq ftFlat PlateIndirect Forced Circulationtank
Rheem RS80-48BP
Show 1 model number
  • Rheem RS80-48BP
5.982 sq ftFlat PlateIndirect Forced Circulationtank
Solahart ASE 302J
Show 2 model numbers
  • Solahart ASE 302J, ASE 302J Free Heat
943.1 sq ftFlat PlateIndirect Thermosyphontank
Tychon FPS/HP 300
Show 1 model number
  • Tychon FPS/HP 300
5.443.1 sq ftFlat PlateDirect Thermosyphontank
Universal Solar Products C80-18
Show 1 model number
  • Universal Solar Products C80-18
4.653.9 sq ftFlat PlateDirect Thermosyphontank
Universal Solar Products D120-18
Show 1 model number
  • Universal Solar Products D120-18
3.571.9 sq ftFlat PlateDirect Thermosyphontank
Solar, gas backup10 sets
AET B-DBS-G2-80-64
Show 1 model number
  • AET B-DBS-G2-80-64
1.965.3 sq ftFlat PlateIndirect Forced Circulationtank
GREENoneTEC Double GT
Show 1 model number
  • GREENoneTEC Double GT
6.744.6 sq ftBatchDirect ICStankless
GREENoneTEC L-GT
Show 1 model number
  • GREENoneTEC L-GT
3.725.7 sq ftBatchDirect ICStankless
Rheem RS120-64BP-TG
Show 1 model number
  • Rheem RS120-64BP-TG
9.965.7 sq ftFlat PlateIndirect Forced Circulationtankless
Rheem RS80-40BP-TG
Show 1 model number
  • Rheem RS80-40BP-TG
824.7 sq ftFlat PlateIndirect Forced Circulationtankless
Sammler A169
Show 1 model number
  • Sammler A169
17.227.1 sq ftFlat PlateDirect Thermosyphontankless
Sammler US200-25
Show 1 model number
  • Sammler US200-25
4.427.1 sq ftFlat PlateIndirect Forced Circulationtankless
Sammler US200-42
Show 1 model number
  • Sammler US200-42
6.145.4 sq ftFlat PlateIndirect Forced Circulationtankless
SunEarth C2-26T-40-TLG
Show 1 model number
  • SunEarth C2-26T-40-TLG
3.326.9 sq ftFlat PlateIndirect Forced Circulationtankless
SunEarth C2-40T-50-TLG
Show 1 model number
  • SunEarth C2-40T-50-TLG
5.241 sq ftFlat PlateIndirect Forced Circulationtankless

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