The plumber mounts and installs plumbing fixtures. Heating can be asked about separately. This fits the case when a new faucet, sink or toilet has to be put in, not just an old one tightened up.
Get the fixture ready beforehand and keep its box with the instructions, and photograph the installation spot as a whole, with the pipes and valves. Clear the access and the space around it, and measure where the fixture will go.
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