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 Friday, July 20, 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.