Thermostat help.

Hi,
Have a new honeywell TH8320WF1029 with a steam boiler. The temperature is set to 68, and the reading on the thermostat which is connected to a remote sensor never shows more or less than 68. The boiler seems to go on for 10 minutes the off for around 10 then on again cycling very often.
1. Is this normal?
2. Is it bad for the boiler and should I switch thermostats?
3. Does this waste gas?

Thanks