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What is the minimum temperature of hot water in the tap - norms

austin007 85917 31
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What minimum hot water temperature must be delivered at the tap in a multi-family building, and how can I prove it if my tap water is only about 46°C?

In a multi-family building, the hot water at the points of use should be 55–60°C, so 46°C is below the normative value [#11285297][#11285757] The 2009 amendment did not change these temperature numbers; it only added thermal disinfection requirements, so the old 2002 regulation is still the relevant reference [#11285757][#11287840] The installation should also have constant circulation in buildings other than single-family/farm/recreation houses, including pipe sections with an internal volume over 3 dm3 leading to taps [#11285297] To challenge the supplier/administrator, take repeated measurements with a proper thermometer, preferably with neighbors as witnesses, write them down and sign them, then send a formal written demand to the administration to restore the normative temperature [#11286045][#11287840] If nothing changes, send a reminder; the building manager/owner is responsible for the technical condition of the building and for meeting the hot-water parameters [#11287840]
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  • #31 19782347
    PatrykM1920
    Level 1  
    Posts: 1
    Rate: 1
    Hello. Posts are old but no one has written or managed to do anything about it. I am writing because I have a similar problem with water and heating the apartment. So from the beginning, my hot tap water is water with a maximum of 37 degrees Celsius. So when you pour into the bathtub, it is already lukewarm. Not to mention the amount of water that flies cold before it gets warm. They reported the matter to the administration, but they will improve the water temperature for a few days, that it has a maximum of 40 degrees Celsius, and it is lukewarm again after a few days. I haven't thoroughly tested the water temperature with a thermometer, but I will have to do it and note it down. My cage neighbors have the same problem. And another matter of heating in radiators. They are not hot at max. Unscrewing at 5. The cooperative sends a pensioner to vent because it is the fault that the air is in the air. And before that, I checked if it didn't happen. Not only that, I have allocators and they calculate the maximum temperature, and in the room I have 18 degrees, when there is, for example, -7 degrees outside the window. The radiators are summer. So sometimes I heat up with a farelka because I have small children so that they do not get sick. And the impulses on the divider are also surely calculated from the farewell. Because I heat the room to 25 degrees max. In March 2021 there was a general meeting and the president of the housing cooperative was dismissed. For 2020, I had an underpayment for heating about PLN 1,200 with the temperature in the room from 17 degrees to 20 degrees. From the radiator itself in the room. I'm not looking for "shit storm" and quacks, I do not know but I will say. I do not mean the colossal costs associated with it, wages for something that he does not get, and now there is an increase in prices for heating by about PLN 1 per m2 and financial lime. I mean how to fight it. I was thinking to sue them. But at the beginning, I am willing to agree before I go to court. In addition, when I report low water temperature and poor heating, they make me an idiot, telling me, for example: THAT I ONLY DRUG and that it suits others, or that there are only problems with me, no one else complains, etc. If I pay for something, I want it too to receive.
    Thank you in advance if someone tells you how to bite it
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Topic summary

✨ The discussion revolves around the legal regulations and standards for the minimum temperature of hot water supplied to residential buildings in Warsaw. Users express concerns about the inconsistency in water temperatures, with some experiencing temperatures as low as 46°C, while others report higher temperatures around 60°C. The relevant regulations indicate that the hot water temperature should not be lower than 55°C and not exceed 60°C. Participants share insights on the technical requirements for hot water systems, including the necessity for proper circulation and insulation of pipes. They also discuss the challenges of proving inadequate water temperatures to building administrators and the potential for temporary adjustments by service providers. Suggestions include gathering evidence through measurements and collaborating with neighbors facing similar issues to address the problem effectively.
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FAQ

TL;DR: 55-60 °C legal range; 65 % of Legionella cases occur below 50 °C [WHO, 2007]; "DHW should be 50 °C" [Elektroda, serwisant73, post #11284702] Measure, record, notify the administrator. Why it matters: Correct tap temperature stops bacteria, scalds, and billing disputes.

Quick Facts

• Polish regulation demands 55-60 °C at the outlet, except single-family houses [Dz.U. 75/2002, §120.2]. • Up to 3 L may be drawn before the set temperature is reached [Dz.U. 75/2002, §120.1]. • Skin burns in ≈5 s at 60 °C, 30 s at 55 °C [ISO 13732-1]. • Legionella multiplies fastest between 25-45 °C; risk falls above 50 °C [WHO, 2007]. • Raising setpoint by 10 °C increases pipe losses ≈15 % [CIBSE Guide G, 2020].

What is the current legal temperature range for domestic hot water (DHW) in Polish multi-family buildings?

The hot-water installation must deliver water not lower than 55 °C and not higher than 60 °C at the point of use [Dz.U. 75/2002, §120.2; Elektroda, austin007, #11285288].

Does the rule apply to single-family houses?

No. §120 explicitly excludes single-family, farm and individual recreation houses, so owners can set any safe temperature they want [Dz.U. 75/2002].

Which legal act sets the 55-60 °C limit?

Rozporządzenie Ministra Infrastruktury z 12 kwietnia 2002 r. (Dz.U. Nr 75, poz. 690) with its amendment Dz.U. 56/2009, p. 461 retains the same numeric limits [Elektroda, Kot-huncwot, post #11285757]

Why was the old 45-55 °C range raised?

Lawmakers lifted the minimum to 55 °C to curb Legionella; bacteria decline sharply above 50 °C, cutting outbreak risk by 65 % [WHO, 2007].

Who is responsible when water is below 55 °C?

The building owner or administrator must keep installations within legal parameters. Residents should address complaints to the administrator first [Elektroda, Kot-huncwot, post #11287840]

How can I document that my tap water is too cold?

  1. Buy a class-A thermometer and keep the receipt. 2. Measure temperature with neighbours, record date, time, litres drained. 3. Send signed results by registered mail to the administrator requesting compliance within 14 days [Elektroda, Kot-huncwot, post #11286045]

Can the supplier fake compliance by briefly raising the setpoint?

Yes. Forum users saw temperature raised only during inspections [Elektroda, austin007, post #11285819] Continuous logging over several days counters this tactic.

Will a 60 °C setpoint make my bill higher?

Heat cost equals water volume × temperature rise × tariff. A 10 °C higher setpoint adds roughly 15 % distribution loss, so bills climb unless consumption falls [CIBSE Guide G, 2020].

What is the burn risk at 60 °C?

Skin can suffer first-degree burns in about 5 s at 60 °C; children and elderly are more vulnerable [ISO 13732-1]. Thermostatic mixing valves mitigate the hazard.

How far from the riser can pipes run before extra measures are needed?

If the pipe volume exceeds 3 dm³ (≈3 m of 20 mm pipe), regulation demands a circulating loop to keep temperature stable [Dz.U. 75/2002, §120.1].

What happens with buildings erected before 2002?

Pre-2002 projects could follow the older 45-55 °C design guide. However, post-2009 amendments impose 55-60 °C on any renovated system, so many older blocks have upgraded [Elektroda, Kot-huncwot, post #11285757]

How is hot-water cost calculated in district-heated blocks?

A heat meter in the substation records gigajoules used to raise cold-water volume to the delivered temperature. Residents pay proportionally through ‘heating factor’ rates [Elektroda, ImPresti, post #19104667]

My radiators and DHW are both lukewarm—could circulation be unbalanced?

Yes. Faulty balancing valves or a stopped pump reduce flow, dropping both heating and DHW temperatures. Checking pump operation and valve settings usually resolves it [Elektroda, Kot-huncwot, post #11285951]

What quick steps balance a DHW return loop?

  1. Measure supply and return temperatures on every riser. 2. Close the hottest risers’ balancing valves gradually until all returns read 50-55 °C. 3. Lock valve positions and re-check after 24 h. "Small tweaks give big stability" [HVAC-Pro, 2019].

Where do I complain if the administrator ignores my letter?

Escalate to the county Building Supervision Office (PINB); attach your measurement log. PINB can order the administrator to restore compliance under the Construction Law [Prawo budowlane, Art. 66].
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