Work on fixed water and heating installations needs an autoriseret VVS-installatør (authorised plumbing contractor), or a firm that brings one. Ask which it is, and ask for that on the invoice (faktura). Authorisations are looked up at Sikkerhedsstyrelsen, sik.dk.
Odense covers the centre and housing areas in Odense C, N and Årslev. Drives on Funen are often shorter than in the capital, but older houses with a basement and a narrow drive can still add time. The same 3 businesses as the Danish page: Odense VVS ApS, Dansk VVS Service Fyn ApS, Blik & VVS Cortes og Nielsen ApS.