| Number | Name | Date | Kind |
|---|---|---|---|
| D244606 | Riley | Jun 1977 | S |
| D255379 | Riley | Jun 1980 | S |
| D257893 | Millhollen | Jan 1981 | S |
| D258608 | du Plooy | Mar 1981 | S |
| D312069 | Williamson | Nov 1990 | S |
| D320649 | Fleming | Oct 1991 | S |
| D752178 | Mjelde | Mar 2016 | S |
| D835940 | Krishnan | Dec 2018 | S |
| 11015870 | Muscatell | May 2021 | B2 |
| 20200309386 | Lin | Oct 2020 | A1 |
| 20210146299 | Besarati | May 2021 | A1 |
| 20210341230 | Ludlaim | Nov 2021 | A1 |
| 20220026078 | Fattoum | Jan 2022 | A1 |
| Entry |
|---|
| Spiral Water Heaters. (Design—© Questel) orbit.com. [Online PDF compilation of references] 31 pgs. Print Dates Range Dec. 24, 2021-Feb. 14, 2020 [Retrieved Feb. 23, 2022]. |
| Solar water heater panels Stock Photo. Sep. 28, 2014. Deposit Photos. https://depositphotos.com/54212039/stock-photo-solar-water-heater-panels.html. |
| DIY Solar Water Heater Thermal Panel. Mar. 23, 2020. Youtube. https://www.youtube.com/watch?v=olTiMKfSqEM. |
| DIY Solar Water Heater. Aug. 28, 2017. Instructables. https://www.instructables.com/DIY-Solar-Water-Heater-Deluxe-Aluminum-Backed-COPP/. |