Default jvm heap size settings.

[dmdeklerk]

Seen "Ran out of virtual memory on 32 bit either use 64 or reduce your heap size" on 32 bit Atom machine with Window 10 32 bit and 2 GB RAm.

[dmdeklerk]

To increase heap size on windows edit the file
\resources\heatledger\bin\heatledger.bat in your installation dir.
Then add jvm args like this

@Rem Add default JVM options here. You can also use JAVA_OPTS and HEATLEDGER_OPTS to pass JVM options to this script.
set DEFAULT_JVM_OPTS=-Xmx1000m -Xms256m

So its the -Xmx1000m -Xms256m that you would be adding there.