Honeywell Thermostat Question

[Mark Smith]

Hello all,

I'm closing on my second property tomorrow (woo!).  I got a head start on a few things, and I bought a couple of 7 day programmable thermostats; they are Honeywell RTH2510B thermostats.  The side of the box mentions some heating and cooling systems it is compatible with.  All I have is a boiler, there is no central AC or anything like that.  One of the items the box states is a 750mv heating system.  I don't know if my heating system is 750mv or 24v.  Should I be concerned that I might fry this new thermostat if it is setup for 750mv but I have a 24v system?  Or should I assume I probably have a 24v system, and that the box is simply stating that the thermostat will also work with low voltage 750mv systems?

Sorry if that was confusing!  Thank you for any advice.