For sale is a LOT of 11 heaters. 6 are enclosed water filled radiators. If you have any questions about the converters please ask. Below is more information about water filled radiators. These are very good if you want to heat your home with solar panels.But do not want dedicated water solar heaters. As these would work from a standard solar panel setup. More information can be found on the "heat electric" website. You are welcome to test them at collection. They are all very heavy so be prepared. Yes you can connect them to a smart thermostat (nest, Honeywell) but you will need one for each of the heaters. No, there is no plumbing of boilers of any type needed. The item "Heat electric central heating radiator water filled no maintenance solar power" is in sale since Tuesday, September 18, 2018. This item is in the category "Home, Furniture & DIY\Heating, Cooling & Air\Air Conditioners & Heaters\Radiators". The seller is "8butterflykisses" and is located in Coventry. This item can't be shipped, the buyer must pick up the item.