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1 power wire (120v) will go to the thermostat and 1 power wire (120v) will go directly to the unit. The other wire on the unit will go to the other side of the thermostat. The safety precaution behind using a singlepole to replace a double pole contactor is that you will always have 1 leg of power going to the unit. Many systems are designed like this from the factory, but it is always better to have a 2 pole to cut all power off to the unit unless it's in operation. The unit will still not work as long as it does not have both legs of power. L1 to Thermostat T1 to Unit L2 and T2 wired together.
This is only for 240v systems. 120v Will have 1 common and 1 power, therefore you will need to know which wire is which. Power to thermostat, common wired direct.
Wiring up a compressor
The Start wire goes to one side of the run capacitor it will be the only wire on that side of the capacitor.
The Run wire goes to the terminal side (T1 or T2) of the contactor, it will have another
wire from that terminal to the run capacitor which is the opposite side of the start wire.
The Common wire will go to the other side of the contactor (T1 or T2).
Start from the capacitor to terminal #1 on start relay There should be another wire from
here to start on the compressor.
Common from contactor ( T1 or T2) to terminal #5 on start relay. There should be a wire from this terminal to the Common terminal on the compressor.(there will not be a capacitor in this circuit)
Run from the other side of the contactor ( T1 or T2) to the start capacitor and from the other
Side of the start capacitor to terminal #2 on the start relay. There should also be a wire from this
Terminal to Run on the compressor.
motor leads on a three phase are T1, T2, T3, T4, T5, T6, T7, T8, T9. for high voltage  L1 to T1, L2 to T2, L3 to T3, connect together and tape - T4-T7, T5-T8, T6-T9. For LOW voltage  L1 to T1 & T7 & tape, L2 to T2-T8 & tape, L3 to T3 & T9 & tape. T4-T5-T6 together and tape.
5 Ohms at the rotor.
Disconnect all the stator wires and measure each one to ground, it should read opened.
Before disconnecting wires, mark which are hot and which are neutral. Measure between the hot neutral wires and some should read at least 0.5 ohms. You should have T1 and T2 reading 0.5 and T3 and T4 reading 0.5. T1 and T3 should read opened, T1 to T4 should read opened. Also, T2 to T3 should be opened and T2 to T4 opened.
What kind of boiler are using is this boiler a on the demand electric or gas? You need low voltage wires. If you get me make and model # of off boiler i can try and find wiring diagram . Tell me a little more about you heat system to. Like baseboard heat or in floor how many zones