We can supply and fit all types of. Everything you need to know about business billing and charges. Is the most expensive option, as taking away the tank and cylinder and reworking the whole system is a lot of work you’re looking at anywhere. How does a smart thermostat work? generally, smart thermostats are built to offer the features a standard thermostat is missing these features include real-time updates to your heating depending on local weather and learning from your day-to-day heating settings.