This article explores the new macro designer and other new macro features available in Access 2010. After reading this article, you will be able to take full advantage of what Access 2010 macros have to offer.
Rules For Sizing Your Heat Pump Pool Heater. 1  Size at 4 BTUâs per gallon or 1 BTU per litre of water. To heat in normal summer conditions when ambient air temperature average 70Â°F in a 24 hour period.  Size at 5 BTUâs per gallon or 1.3 to 1.5 BTUâs per litre of water.
The British thermal unit, or BTU, is a unit of energy, one that is used to quantify the heating and cooling power of, water heaters, air conditioners and similar equipment. Definition. A BTU is the quantity of heat needed to raise one pound of water by one degree Fahrenheit. More BTUs mean more heating power. Significance A water heater is ranked by BTU input, but really means BTUs/hr; thus a 33,000 BTU heater can heat 33,000 pounds of water by one degree in an hour; or, 330 pounds by 100 degrees. Recovery Rate A more common measure for water heaters is the recovery rate, which indicates the amount of gallons of water that can be heated to 100 degrees Fahrenheit in one hour.