We recently bought a bungalow constructed in 1959 with an uninsulated 150mm thick concrete floor. The radiators are over 25 years old and we're planning to completely renovate the house in order to make it as eco-friendly and efficient as possible. We'd like to install a wet underfloor heating (UFH) retrofit system.

We're looking at systems which are 15-20mm thick with grooves in them for pipes to be laid and often made of polystyrene insulation boards. We also then plan to lay cement boards instead of screed. We understand wet UFH would take longer to heat up than radiators, but we're trying to compare the amount of energy used and the cost of running. We also recognise that other factors such as wall/loft insulation and windows play a big role. We plan to address these as part of our renovation and our primary fear is the concrete floor. Knowing our flooring is uninsulated, would a wet UFH retrofit kit be able to heat our home more efficiently than radiators? Is there a better solution we should consider for heating our home in an eco-friendly and efficient way?