The Kombi-TRV is a thermostatic radiator valve with an inbuilt differential pressure controller. This combination of two valves in one ensures optimal room temperature control and easy automatic hydronic balancing. Piping and pressure loss calculations are not needed, it requires only the max design flow to be set directly on the Kombi-TRV. The inbuilt pressure controller ensures that the set max flow is maintained under varying system pressure conditions, simply and easily eliminating the common consequences of an unbalanced heating system.