Spa heater system and methods for controlling
US7236692B2 · kind B2 · utility
25Cited by
16References
10Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Dec 1, 2004 |
| Grant date | Jun 26, 2007 |
| Priority date | — |
| Expiry date | Dec 1, 2024 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY10T29/49826
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A spa system comprises an electrically powered heater. The electrically powered heater comprises a heating element capable of drawing a rated current when switched on to an AC line voltage. An electronic control system is programmed to control the heating element to draw less than the rated current.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.