As great as radiant floor heating was, in the past one of the drawbacks was how much square foot coverage you can have with your heated floor mats which could be powered under one thermostat. It used to be, that with a 120V radiant floor heating system, you could cover about one hundred and fifty square feet, and with a 220V radiant floor heating system, you could cover about three hundred square feet. If you wanted to cover additional square footage with in floor heating, you would have to add another thermostat - or perhaps add a relay to the system. Neither of these things was a huge drawback – however, you could not control large areas of radiant floor heating, or even whole houses, with the use of just one thermostat…..UNTIL NOW! ThermoSoft has introduced a nifty little device called a "power module", which is manufactured by OJ Electronics in Denmark. It is only compatible with OJ manufactured thermostats, which ThermoSoft sells as well. What this nifty little device does, is helps you expand your floor heating system coverage area INFINITELY (so long as you have the correct amount of power coming to your house)! For a 120V floor heating system, you simply add one power module for each additional one hundred and fifty square feet you'd like to cover. For a 240V floor heating system, you simply add one power module for each additional three hundred square feet you'd like to cover. So now, whether you want to control one floor of radiant floor heating or a whole house – it is possible with ThermoSoft's new OJ Power Module!