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2. Water heating - Wikipedia

   en.wikipedia.org/wiki/Water_heating

   A BTU is the energy required to raise one pound of water by one degree Fahrenheit. A US gallon of water weighs 8.3 pounds (3.8 kg). To raise 230 L (60 US gal) of water from 10 °C (50 °F) to 50 °C (122 °F) at 90% efficiency requires 60 × 8.3 × (122 − 50) × 1.11 = 39,840 BTU. A 46 kW (157,000 BTU/h) heater, as might exist in a tankless ...

3. Tankless water heating - Wikipedia

   en.wikipedia.org/wiki/Tankless_water_heating

   Power outage: In case of a power outage, tankless heaters cannot supply hot water, unlike tank based heaters which can supply the hot water stored in the tank. LED Light Strobe effect: Most residential demand water heaters act by modulating the heating elements to match the flow rate. This is required to prevent overheating in the heating chamber.

4. M970 - Wikipedia

   en.wikipedia.org/wiki/M970

   M970's were used to assist in loading the bladders for the Tactical Airfield Fuel Dispensing Systems (TAFDS) in the field as well. Part of the TAFDS, the fuel bladders. The M969/M969A1 is a self loading and unloading tank semi-trailer designed to carry and dispense fuel to other vehicles at Forward Arming and Refueling Points.

5. Fuel cell - Wikipedia

   en.wikipedia.org/wiki/Fuel_cell

   PEM fuel cell with operating temperature of 120-200 °C is called High Temperature Proton-exchange membrane fuel cell (HT-PEMFC). [65] Solid oxide fuel cell (SOFC) A type of fuel cell in which the electrolyte is a solid, nonporous metal oxide, typically zirconium oxide (ZrO 2) treated with Y 2 O 3, and O 2− is

6. Gallon per watt-hour - Wikipedia

   en.wikipedia.org/wiki/Gallon_per_watt-hour

   Residential pool pumps were first included in the 2005 Title-20 appliance standards that were adopted at the end of 2005. California has a limited ability to produce electricity. When California electrical demand exceeds its production capacity the utility companies must purchase electricity, usually form out of state companies at a much higher ...

7. Circulator pump - Wikipedia

   en.wikipedia.org/wiki/Circulator_pump

   This avoids one of the principal challenges faced by the larger, two-part pumps: maintaining a water-tight seal at the point where the pump drive shaft enters the pump body. Small- to medium-sized circulator pumps are usually supported entirely by the pipe flanges that join them to the rest of the hydronic plumbing. Large pumps are usually pad ...