Commands you can use are:
HW ON - Turns your hot water on to continually keep your hot water warm.
HW OFF - Turns your hot water off. Your hot water will remain off until you turn it on, set it to schedule or boost it.
HW AUTO - Turns your hot water schedule on. Use this to return to your usual hot water schedule after using ‘HW ON’, or if your hot water was previously off.
HW BOOST - Turn your hot water on for 1 hour to Boost your hot water, handy for when you need hot water quickly. After 1 hour the system will return to its previous status.
HW STATUS - Sends you back the current mode of your hot water system.
HW HELP - Request a list of available text commands.
Don't forget you can also control your heating by text.