Click on the "How To Calculate Heater Size" link on Pool Gear Plus's Pool Heaters page for a chart.
Hum, don't you mean 350 gal spa? Most appropriate heater size would be 400,000 in your choice of brands (Raypak). Wow, 3500 gal. it must be at least 10' x 16' x 3' quite impressive but impractical.
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My jacuzzi is about the same size and takes about 1.5 hours to rise from 60 dregrees to 98 degrees. My heater is a Purex Triton Minmax 250. I don't know if this is typical.
Usually about an hour.
Around 3 hours
130000 btu
I would go with no less than a 250,000btu. Reason being is the smaller you get the more time it takes to heat the spa thus using more gas. I prefer a 330,000btu. It will heat the spa in 50f water to 100f in approximately 30-40mins.
If there is water in it you can heat it.
let the heat Melt the fat away
It all depends on how much the tank holds and the wattage of your heater I like to have 10 wattage for ever gallon so if you hVe a ten gallon tan you need a 100 watt heater also the temperature of you want will make a deference normally my 20 gallon tank can go from 46F to about 77 F in two hours
no
noo estarias pendejo si si xD
Heater produsces - heat recovery finds heat and reuses it
To calculate the amperage, you can use the formula: Amperage (A) = Watts (W) / Voltage (V). In this case, the heater draws 3500 watts and operates at 230 volts. So, the amperage will be approximately 15.22 amps.