I don&#x27;t claim to be an expert but I have a forced hot water system (converted at some point from steam) and AFAIK it uses a &quot;standard&quot; thermostat. At least when I upgraded to a Honeywell programmable thermostat 15 years or so ago, I don&#x27;t remember it being anything unusual. I bought a thermostat at the home improvement store and an electrician who was doing some other work installed it.