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.
As a basic rule of thumb, each GPM subtracted from the total allows a 10-degree increase in water temperature. In this scenario, a 200,000 BTU water heater would be able to heat all of the water in a house at a 6.4 GPM flow rate to 110 F, and at a 5.4 GPM flow rate, all the flowing water would be heated to 120 F.