You can hang a 1 phase boiler between two legs of the three phase supply, probably 208 three phase is handiest because it gives you three 120 legs. Though 240 three phase with a wild leg gives you two 120 volt legs and runs motors on 240 OK.
The boiler for single phase probably has one or two heating elements. The boiler for three phase will have at least three, maybe 6.
Wiring, breakers, and service tend to be more expensive for three phase because there are three circuits instead of two, and there are no home grade three phase products. There is much more single phase electrical service equipment made than three phase industrial, which lowers the cost of single phase equipment.
480 volt breakers and switches and contactors are several times the price of 240 volt because its harder to get the 480 interrupted. And the consequence of not stopping the arc is that the panel burns down completely.
Three phase is nice for motors, they are smaller for the hp and run quieter and if they are built into machinery its hard to change to single phase, but the modern Variable Frequency Drives, a solid state box make that a lot easier.
You won't get any more heat per KWH from three phase or single phase, but you will pay your utility more for three phase service than for single phase though the rate per KWH after the monthly fixed charges will probably be the same.
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