Building age is not the deciding factor
Two older houses can behave completely differently. One may have upgraded windows and a well-insulated roof while another has major air leakage and little insulation. The decision should be based on real heat demand rather than construction year alone.
Existing radiators are often the critical point
Radiators should be checked at the planned heat-pump water temperatures. If they can cover room demand around 45–55°C, conversion can be relatively straightforward.
Insulation can be more valuable than a larger heat pump
Reducing building heat loss decreases both required capacity and annual electricity consumption. Roof insulation, air-tightness improvements and better windows can have a major effect.
High-temperature capability does not mean permanent maximum-temperature operation
Some heat-pump models can produce high water temperatures. This provides useful retrofit flexibility, but seasonal efficiency generally improves when the required supply temperature is kept as low as practical.
How do you check project feasibility?
Start with design heat loss, radiator temperature requirements, available electrical capacity and the condition of the hydraulic system. Final equipment selection should be technically verified.
