I am trying to install 2 2500 watt baseboard heaters each on its own 240v 20 amp circuit. That part I can do, but I want to tie them into one thermostat, How is this done? Anyone help,Thanks

Separate circuits will probably require separate thermostats, unless you incorporate some type of relay to isolate the heater circuits from the thermostat.

Do they not make a thermostate that can handle two circuits?

No, not that I've ever seen.

Some line voltage thermostats for applications like yours do have 2 circuits, but they are intended to break both lines to the heater. The contacts won't last long if used to break one line to each heater.

It seems to me that this problem must have been encountered before I am surprised that there is no apparent solution? Not sure what to do!

Is there some reason that you cannot install separate thermostats for each heater?

Well, if you really want to, but don't want to run a lot of wires, but to tell you the truth, you can use an HVAC tstat and two 24 VAC contactors and your done. That may allow other options.

You need 20.83 Amps for both heaters together. A line voltage stat that can handle that should be findable. Just connect the heaters in parallel.

Since these are space heating, the wiring need to be sized to 125% of total load.

You can also, use a current switch and a contactor, if you want them to be separate and use a line stat. You feed one of the conductors around the sensor and use the pilot duty relay to energize a contactor for the other one.

There are all sorts of ways. Each will have different costs and capabilities.

Both heaters are in the same room, It doesn't make sense to have 2 thermostates

Hey KC13:

In a new building that was moved to in the early 90's. Air to water heat pumps everywhere. One room had two heatpumps because of an unusual load.

Two thermostats, both auto-changeover. Talk about innefficient.