If it's similar to air source heat pumps but has a low coefficient, do you think I am better off with just regular heat pumps instead of such thermodynamic systems? This page actually says thermodynamic systems are much cheaper in the long run compared to boilers. [url]https://www.greenmatch.co.uk/solar-energy/solar-thermal/thermodynamic-panels[/url] Though it does not compare it to ASHP... I've got a two-bedroom house, so I'm not looking for a very large system.