If the heater has a specified branch circuit rating with the manufacturer's information then follow that. If not then assuming it is to be run more than 3 hours per day:
19.7 A x 1.25 = 24.6 A
Next size standard breaker is 25 A (see NEC 240.6)
So you will need #10 AWG Copper and a 25A 2 pole breaker.
A GE tandem breaker can be removed and replaced with a GE single pole breaker.
New moon.
Boiling is a physical process, a change of phase.
a phase change
Boiling of water is a physical process, a change of phase.
If you mean "a" circuit breaker for two (2) three-phase motors, then yes. As long as the rating is not exceeded by the current draw of the two motors. This would, of course, require the use of a three phase breaker arrangement, and power from a three phase source. The question is kind of vague. Now, just saying that it can be done is one thing, but should it be done? That is where you need to refer to your local authority having jurisdiction (AHJ) over electrical matters. However, in a normal industrial/commercial setting (3-phase power), an MCC would normally be used, with one breaker/circuit per motor.
Your gas heater doesn't come on? Why's that? What kind of heater is it? Have you gone to the manufacturer's website, looked up the owner's manual and read he "troubleshooting" section? If you've done that and you still don't have heat, you should check the breaker, check the fuse mounted next to the heater, and then call a reputable HVAC contractor.
A GE tandem breaker can be removed and replaced with a GE single pole breaker.
single phase...
#12/2wground & a 20 amp breaker should be enough for lights,receptales.
organization
There are many different phases. What kind of phase are you interested in?
Phase
You'll need to be far more specific. What sort of heater? What kind of controls does it have? Thermostat settings?
Depends on the heater. You can have Electric heaters, propane heaters only to mention two.
You use the correct size breaker that matches the wiring. The correct amperage will be listed in the owners manual for the tub.
The 4100 takes an SD card. We suggest a high speed card.