There are zero amps in a 6kW 3 phase heater. Amperage is the result of dividing the Watts by the Voltage. A = W/E. Without stating the voltage the heater operates on the amperage can not be calculated.
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The equation you are looking for is, Amps = kW x 1000/1.73 x Volts x PF. 6000 watts is the same as 6 kW. The power factor constant to use should be .9.
There are zero amps in 6600 watts. Watts are the product of amps times volts. W = A x V. To find amperage use the following equation, A = W/V, so as you can see a voltage value is needed in the equation to result in an amperage.
I'm assuming the electrical system is single phase, such as a home. If not, you need to hire someone to do the work for you. First, 6000 watts at 120v is 50 amps, so if your load is truly 6000 watts, 30 amps isn't enough. If your 6000 watts is 240v, which would draw 25 amps, then 30 amps is plenty. Ten gauge wire may not be placed an a breaker or fuse larger than 30 amps.
Six KVA is the same as 6000 watts. As you can see, the appliances have to be totaled up to the amount of 6000 watts to see how many can be used. Each device has its own wattage on the manufactures label and it is usually different for different appliances.
You better have a 10,000 watt capable generator.
Efficiency is measured as the ratio of power output to power input. In this case the power input of the generator is 240V * 25A = 6000 VA however the stated losses are 900 W so the power output is 6000 - 900 = 5100W. Then the efficiency would be 5100/6000 = 0.85 or 85% efficient.