It is feasible to heat a greenhouse range with warm
water from a power plant if water temperature is
above 80°F. A flooded floor system or dry system
can be used for heat distribution. If a flooded floor
system is used, however, additional air heating is
necessary during the coldest part of the heating
season. A design capacity back-up heating source
is required for the range because electric power
generating plants cannot guarantee 100% continuous
operation and it cannot be predicted when a given
plant will be shut down for an extended time period.