portable water heater for a hot tub or pool

I recently bought a portable hot tub.
Intex PureSpa month-
Portable inflatable bubble jet bathtub.
When looking at the specifications and comments, I was concerned about the heating capacity of the unit.
The heating device of 1,300 watts only heats water 1-
2 degrees Fahrenheit an hour
Customer reviews also indicate a significant increase in their electricity bills.
This information led me to come up with a portable water heater solution.
I\'m not a handyman anyway, so it\'s very welcome to suggest and optimize ideas.
Please let me know what you think about my first note.
Here are the basic components I use to make portable water heaters. Camplux 5L 1.
32 GPM outdoor portable propane no tank water HeaterFlojet 03526-
144A three-cylinder diaphragm automatic pump, 2.
9 GPM 50 PSI, 12 V DC4-
1/2 to 1 1/4 stainless steel hose flap 2-
1/2 \"galvanized sofa 2-
1/2 \"men\'s non-proliferation treaty X 1/2\" hose Barb2-
10\' woven vinyl tubing 1/2 \"inner diameter kastar AC adapter, Power 12V 6A 72WTeflon suede wrench and screw drive apply Teflon tape to thread, and manually tighten the 1/2 \"coupling and 1/2\" to the hose of the water heater unit inlet and outlet.
Paste the hose onto the hose rewind and tighten it with the hose fixture.
Connect the hose using the hose hook attached to the pump and tighten it with the hose clamp.
Make sure you follow the direction arrow indicating the flow of water through the pump so that it can breathe water into the water heater from the water source.
Connect the supplied propane supply line to a 20-pound propane tank and check for leaks using soapy water on the connection point.
If you see that the bubbles close the propane and tighten the connection point, do not tighten too much.
Once the leak is not detected, install it in a safe location.
It must be installed on the outside that provides sufficient ventilation.
I have plenty of space under my deck and the heat will dissipate and will not overheat the wood.
Connect the power supply to the pump.
The outside of the barrel is negative (-)
It\'s positive inside (+).
Do not insert the pump until all water connections are connected and the suction end is submerged in the water.
Check all connection points to make sure they are tight enough not to leak.
Make sure to turn on propane.
If not already installed, place the 2d battery in the water heater.
Make sure both ends of the hose are underwater.
The suction hose must remain submerged at all times.
When you are ready to connect the power to the pump, the water starts to flow.
Once the water flow is detected in the water heater, it will automatically start the flame.
You can see this in the flame window in front of the water heater unit.
Whatever you\'re heating, relax and watch the temperature rise.
Be careful that if the flow of water is low and the gas is high, it can produce water that is hot enough to scold and burn.
This should be supervised by qualified adults at any time. Enjoy! :-)