# US 5,345,996 A · Energy saving water and air bubble heat maximizer for swimming pools, hot tubs, and spas > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,345,996 A - Document ID: US5345996A - Status: Granted - Kind: A - Application number: 08/053,720 - Filed: 1993-04-27 - Granted: 1994-09-13 - Earliest claimed: 1993-04-27 - Inventors: Robert H. Druien - Web page: https://patentgrep.com/patent/US5345996A ## CPC - F28D 21/0008: {Air heaters} - A61H 33/0095: {Arrangements for varying the temperature of the liquid} - A61H 33/60: {Components specifically designed for the therapeutic baths of groups A61H33/00 (plumbing E03C1/00)} - A61H 33/02: Bathing devices for use with gas-containing liquid, or liquid in which gas is led or generated, e.g. carbon dioxide baths {(A61H33/6026 takes precedence)} - Y10S 165/909: Regeneration - F28D: HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT (fluid heaters having heat generating means and heat transferring means F24H; furnaces F27; details of heat-exchange apparatus of general) - A61H: PHYSICAL THERAPY APPARATUS, e.g. DEVICES FOR LOCATING OR STIMULATING REFLEX POINTS IN THE BODY; ARTIFICIAL RESPIRATION; MASSAGE; BATHING DEVICES FOR SPECIAL THERAPEUTIC OR HYGIENIC PURPOSES OR SPECIFIC PARTS OF THE BODY (electrotherapy, magnetotherapy, radiation therapy or ultrasound therapy A61N) - Y10S: TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS ## Abstract An adjustable, energy saving, high speed, air bubble and water heating system extracts waste heat from the exhaust of a water heater on a swimming pool, hot tub, or spa to heat air and/or water. The use of the waste heat results in accelerated heating of the water and creation of heated air bubbles without any additional heat energy requirements. The temperature of the water and air bubbles is independently controllable via manual controls or automatic thermostat. ## Claims ### Claim 1 A method for reclaiming waste heat from a heater for a bathing facility such as a spa, tub, or pool, the method including the steps of: locating a secondary heat extractor in the exhaust path of the heater; moving air to the input of the secondary heat extractor; heating the air as it passes through the secondary heat extractor; and moving the heated air from the output of the secondary heat extractor to the spa, tub, or pool. ### Claim 2 (depends on 1) A method as in claim 1, further including the steps of: measuring air temperature prior to injection of the air into the spa, tub, or pool; bypassing a portion of the air around the secondary heat extractor with valve means such that the temperature of air entering the spa, tub, or pool can be adjusted. ### Claim 3 (depends on 1) A method as in claim 1, further including the steps of: using a thermostat to measure air temperature prior to injection into the spa, tub, or pool; providing a bypass conduit to bypass a portion of the air around the secondary heat extractor; controlling automatic valve means with the thermostat to divert some air to the bypass conduit such that the temperature of air entering the spa, tub, or pool can be automatically maintained. ### Claim 4 (depends on 1) The method of claim 1, further including the step of attaching the secondary heat extractor such that it is removably attachable to the heater. ### Claim 5 A system for heating air bubbles and water with reclaimed waste heat from a heater for a bathing facility such as a spa, tub, or pool, the system comprising: a heat extractor attached to the exhaust of the heater, the heat extractor further comprising: a secondary heat extractor having an air input, an air output, and air conduit means connecting the air input to the air output; and a tertiary heat extractor having a water input, a water output, and water conduit means connecting the water input to the water output; an input air conduit to provide a path for ambient air to the air input of the secondary heat extractor; an output air conduit to provide a path for heated air from the air output of the secondary heat extractor to the spa, tub, or pool; an input water conduit to provide a path for water from the spa, tub, or pool to the water input of the tertiary heat extractor; an output water conduit to provide a path for heated water from the water output of the tertiary heat extractor to the spa, tub, or pool; blower means for moving air through the input air conduit, the secondary heat extractor, and the output air conduit; and pump means for moving water through the input water conduit, the tertiary heat extractor, and the output water conduit. ### Claim 6 (depends on 5) A system as in claim 5, further comprising: a thermometer to measure air temperature prior to injection of the air into the spa, tub, or pool; a bypass conduit to provide a bypass air path around the secondary heat extractor; and valve means to divert some air to the bypass conduit such that the temperature of air entering the spa, tub, or pool can be adjusted. ### Claim 7 (depends on 5) A system as in claim 5, further comprising: a thermostat to regulate air temperature prior to injection of the air into the spa, tub, or pool; a bypass conduit to provide a bypass air path around the secondary heat extractor; and automatic valve means under control of the thermostat to divert some air to the bypass conduit such that the temperature of air entering the spa, tub, or pool can be automatically maintained. ### Claim 8 (depends on 5) The system of claim 5, wherein the heat extractor is removably attachable to the heater. ### Claim 9 A heat maximizer for reclaiming waste heat from a heater for a bathing facility such as a spa, tub, or pool, the heat maximizer comprising: a heater; an exhaust input to receive heated fumes containing waste heat exhausted from the heater; a secondary heat extractor positioned in the exhaust path of the heated fumes received by the exhaust input, the heat extractor further comprising at least one heat transfer conduit, at least one input for inputting air into the heat transfer conduit and at least one output for outputting air from the heat transfer conduit to the bathing facility; and an exhaust output to vent the heated fumes after the waste heat has been extracted. ### Claim 10 (depends on 9) A heat maximizer, as in claim 9, further comprising: a tertiary heat extractor positioned in the path of the waste heat produced by the heater, the tertiary heat extractor further comprising at least one heat transfer conduit, at least one input for inputting water into the heat transfer conduit and at least one output for outputting water from the heat transfer conduit. ### Claim 11 (depends on 10) A heat maximizer, as in claim 10, wherein air and water are heated simultaneously. ### Claim 12 (depends on 11) A heat maximizer, as in claim 11, wherein: the heat transfer material heated by the secondary heat extractor is air; and the heat transfer material heated by the tertiary heat extractor is water. ### Claim 13 (depends on 9) A heat maximizer, as in claim 9, wherein the heat extractor is removably attachable to the heater.