Water heater or district heating: where your hot water comes from

District heating: most Soviet-era panel blocks

If you live in a panel building from the 1960s to 1980s in a district like Mustamäe, Õismäe, or Lasnamäe, you are almost certainly on district heating. Hot water and space heating both come from a heat exchanger, usually in a technical room in the basement, fed by the city network rather than any boiler in the flat.

The exchanger transfers heat from the district network's water into a separate loop that runs to your taps and radiators, so the water you use never actually mixes with the network's own water. When this equipment ages or gets clogged with mineral deposits, hot water in the whole building runs weaker or takes longer to arrive, not just in one flat.

Because the equipment belongs to the building, individual flat owners cannot repair it themselves. Faults go through the apartment association, which arranges service with a company qualified to work on district heating substations.

A shared building boiler: older blocks without a direct district link

Some older buildings, particularly ones not connected directly to district heating or with a more complex internal layout, run hot water through a shared boiler in the basement or a technical space rather than a heat exchanger. It heats a central tank or loop that then supplies every flat.

This setup behaves a lot like district heating from the resident's point of view: one fault affects everyone, and the fix is the building's responsibility rather than any single owner's. The difference matters mainly for maintenance contracts and who the association calls when something goes wrong.

If your building has a boiler room rather than a small exchanger cabinet, and the heat comes from burning gas or another fuel on site rather than from a citywide network, this is likely your setup. It is worth checking your building's maintenance documents or asking the board, since the two systems are easy to mix up from a flat.

Your own water heater: houses and some flats

Private houses, and flats in buildings that were never connected to district heating or a shared boiler, typically have their own water heater. This is usually an electric tank of 80 to 200 litres, sometimes a gas-fired unit, occasionally a heat pump water heater in newer builds.

With your own unit, you are in full control and fully responsible. A worn heating element, a failed thermostat, or a build-up of limescale on the element are the usual reasons hot water runs out fast or never gets properly hot. These are faults you can diagnose and, in some cases, have repaired without involving anyone else in the building.

New developments around Tallinn with underfloor heating often pair it with a heat pump or a dedicated hot water cylinder rather than a network connection, so even a modern flat is not automatically on district heating. Age and building type are a guide, not a guarantee.

How to tell which system you actually have

If you are not sure, a few checks will usually settle it. Start with your heating bill or building documents, since apartment associations on district heating bill it as a separate line item, often called soojusenergia or similar on the statement.

Physical clues help too. A locked technical room in the basement with pipework and gauges points to a shared exchanger or boiler; a tank in your own flat, cupboard, or utility room means you have your own water heater.

When in doubt, ask your korteriühistu board or management company directly. They will know exactly what serves the building, and it saves you calling out a plumber to diagnose a fault that turns out to be a building-wide one.

• Check your heating bill for a line item covering hot water or district heating
• Look for a locked technical or boiler room in the basement
• Check your own flat or utility room for a tank or wall-mounted unit
• Ask the apartment association or management company if unsure
• Note whether neighbours have the same problem — a shared system affects everyone at once

Who pays for the repair: flat, building, and your own boundary

On district heating or a shared boiler, the substation, the boiler itself, and the pipework up to the point it enters your flat are the building's responsibility, funded through the maintenance fee the korteriühistu collects. You are not expected to pay for or arrange a fix to the exchanger yourself.

Once water crosses into your flat, though, the taps, the internal pipework, and any fittings are yours. A weak flow at just your kitchen tap while the rest of the building is fine usually points to something on your side, not the building's.

If you own your own water heater, in a house or a flat with a private unit, the whole thing is your responsibility from the tank to the tap. This includes servicing, descaling, and replacing parts when they wear out.

We do plumbing work from 45 € per hour, and if a repair turns into swapping out a radiator or adding one, that is a separate job from 85 €. Either way we would look at what is actually happening before quoting anything larger.

When it is more than just weak hot water

Weak hot water that has been building up gradually over months is usually limescale or a tired heat exchanger, ordinary wear rather than an emergency. Sudden total loss of hot water, especially with cold water also affected, is worth reporting to the building management straight away since it may be a shared fault.

Warm water at the tap but with a burning or metallic smell, or water that runs a rusty colour, points to something wrong with a tank or pipework rather than simple mineral build-up, and is worth having looked at rather than waited out.

We do not do gas work, so a gas-fired boiler fault goes to a gas specialist, and we do not touch load-bearing walls, which occasionally come up if a boiler cupboard needs altering. For anything involving district heating equipment, that call goes through your apartment association, not to us directly, since the equipment is not owned by any single flat.