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Sizing A Pool Heater Calculator . With gas and propane pool heaters being the most powerful pool heating units you can use for residential use, they have btu output ranging from 100,000 to 500,000. This answer is the minimal btu size recommended for that particular surface area. Hayward H300FD Natural Gas or Propane Pool Heater 300,000 BTU from www.poolheatpumps.com Up to 17,000 gallons up to 27′ round or 18′ x 33′ oval. Both the shape and size of your pool or spa affect the time it takes to heat up and the amount of energy required to heat it. This total figure of 3,735,000btu is the energy produced by the pool heater in 24hrs.

Recirculation Pump Sizing Calculator . Three simple steps and you will get a pump performance calculation. In a recirculation system, the pump must be sized to provide sufficient flow to compensate for the total heat loss in all the supply branches to the furthest fixture in each circuit. Domestic Hot Water Recirculation Part 4 Pump Sizing Example from jmpcoblog.com Coefficient, or k value, that can be used to calculate the fittings headloss for the pump system (2). The area is d2 / 4 and the flow rate is whatever For snow melt systems with a 50/50 mix of glycol and water, the above equasion is slightly different:

Junction Box Sizing Calculator . You can review the following articles in the same course for more information: Calculate the minimum pull box width as six times the largest raceway size, plus the sum of all other raceways entering the same wall. electrical Can you run a junction inside an outlet or recessed light from diy.stackexchange.com For conductors 4 awg and larger, pull boxes and junction boxes must be sized in accordance with nec article 314.28. The conduit sizing calculator is a helpful tool for engineers to answer questions regarding the size conduit to use per nec® guidelines. Hoffman a reputable manufacturer has a standard size of 24x6x4.5 however i don't think a 4.5 depth is suitable given a 4 conduit is being used.