Hey Dan. Thanks for the above info. Concerning the RX20, which I assume will go thru hot water as fast as a 360, can I assume the same water flow and heater performance? (also using a Mytee Turbo Hot water heater, and stock jets which list as 80015)

I will be using an RX20 with a speedster, curious if the heat will keep up. Plan to boost with Mytee Turbo heater when more heat is needed and power is available...

Can you point me in the direction of some of the formulas you used to calculate heat gain? that would be spectacular!

Mike

Mike, I'm unfamiliar with the RX, but if the flow is the same the temp will be as well. If you really want to know about the math, I will share, but don't blame me if your eyes glaze over and you fall asleep... For those that don't like the techie stuff, look away now!

The accepted conversion for watts to BTU is 1000Wh = 3412.3 BTU. I won't go into the conversion for this - not important here.

So, the volcano's 6000W translates into 20,473 BTU. Run it for an hour and you get 20,473 BTUH (BTU's

**per hour**).

One BTU will raise one pound of water one degree (F). So, we need to convert our water flow into pounds. Oops, I guess we need to know our flow first. I published a real-world flow table in a previous thread, from that table I can see that an 045 flow (three 015 jets) at 250 psi (I just picked an average pressure) with a 100' hose will flow right around 1 gpm.

1 gallon = 8.34 pounds, so our flow is 8.34 pounds per minute, or (X60) 500.4

**pounds per hour**.

So, we have 20,473 BTUH to heat 500.4 pounds of water. 20,473/500.4 = 40.91.

In a perfect world, you would see a rise of about 41 degrees, but this is not a perfect world! Because of wiring losses and efficiency less than 100%, your rise will be a little less. Scott W predicted 35 given the video he saw, this is in line with what I suggest as well. There is no way to accurately predict the losses given we don't know particulars about the volcano's construction.

Substitute 2400 watts (Mytee) or any other wattage heater into the formula, then subtract 10 or 15 percent for losses, and you can calculate heat rise for any heater. If you can bucket test your wand or rotary to get accurate flow at your operating pressure, you can actually get pretty close!