iTechGuides is reader-supported. When you buy through links on our site, we may earn an affiliate commission. As an Amazon Associate I earn from qualifying purchases. Learn more
There is no universal temperature. Recovered data-center heat must reach the temperature required at the receiving district-heating network’s connection point, under that network’s actual flow and pressure conditions. Conventional air-cooled facilities often provide low-grade heat, so a heat pump usually raises it. Published examples include a Braunschweig project delivering 70 °C supply water from a 25 °C cooling-water source, while a 2024 study modeled high-temperature heat-pump delivery up to 120 °C. Those figures describe specific designs, not a general district-heating threshold.
Source temperature and delivery temperature are different
A data center’s cooling loop has a source temperature: the temperature of the water or other fluid carrying heat away from servers and cooling equipment. The district-heating system has a delivery temperature: the temperature needed at the point where recovered heat is injected into its supply or return circuit.
Confusing these two temperatures leads to bad sizing decisions. A cooling loop at 25 or 30 °C does not mean the network can accept 25 or 30 °C water directly. Conversely, a network that can accept heat at a lower return temperature may require less temperature lift than a network demanding a hotter supply.
Quick wins for a faster PC:
Repair Windows errors before they cause bigger problemsFix Now →Scan for outdated or missing drivers - takes under a minuteDriver Scan →The receiving utility sets the target. Its requirement depends on network design, the connection point, seasonal operating conditions, and whether the project supplies a return line, a supply line, or a local subnetwork. The only defensible answer to “what temperature is required?” is therefore the temperature specified by that particular network operator.
#1 Best Overall
- Used Book in Good Condition
Published temperature examples
The following cases show the range of real designs and modeled configurations. They should not be treated as universal standards.
| Case | Source-side temperature | Network-side temperature or connection | What the source reports |
|---|---|---|---|
| Traditional air-cooled data centers | About 30 °C | Not stated; a heat pump is generally needed for a hotter network connection | Benjamin Ott and Peter Radgen describe this low-grade waste-heat level in 2023 IEA DHC conference proceedings. Read the proceedings. |
| Braunschweig, Germany | 25 °C cooling water, cooled to 18 °C after heat extraction | 70 °C network supply | A heat pump raises network return water to a 70 °C supply temperature in the implementation-guidebook example. See the IEA DHC guidebook. |
| Technical University of Darmstadt high-performance computer | 40–45 °C cooling water | District-heating return line at 60–75 °C | The hot-water-cooled system was installed in 2020 and began operating in early 2021; a heat pump provided the lift. Read the Energy Reports study. |
| ORNL-indexed high-temperature heat-pump study (2024) | Model-dependent | Configurations modeled for delivery up to 120 °C | This is a modeled upper output for studied configurations, not a claim that district-heating networks generally require 120 °C. View the publication record. |
Why a heat pump is usually the bridge
A heat pump extracts heat from the data-center loop, raises its temperature, and transfers it to district-heating water through a heat exchanger. The size of that temperature lift is the difference between the usable source temperature and the network’s required temperature at the connection point.
For example, the Braunschweig case starts with 25 °C cooling water and produces 70 °C supply water. The heat pump does not simply “add” 45 degrees in a single passive step; it consumes electricity to move heat from the lower-temperature loop to the higher-temperature network. The exact electrical demand depends on the heat-pump design, lift, flow rates, refrigerant cycle, source and sink temperatures, and operating controls.
Windows Errors? Fix Them Before They Spread
Repair common Windows errors and clear accumulated junk for a smoother, more stable PC - no reinstall needed.Free scan · no reinstallCrashes, No Sound, or Screen Glitches?
Random freezes, missing sound and display glitches usually trace back to one bad driver. Find and replace yours safely.Free scan · under a minuteTechnical University of Denmark guidance explains the central trade-off: a smaller temperature difference generally means lower heat-pump electricity use. A warmer source, a cooler network target, or a connection to a lower-temperature return circuit can therefore improve efficiency. DTU’s explainer discusses how data-center heat can be used in district heating.
“High-temperature heat pumps can be critical in boosting the data center’s waste heat for district heating, improving the system-level energy efficiency of data centers, and reducing CO2 emissions in district heating.”
How cooling design changes the starting temperature
Conventional air cooling
Ott and Radgen describe waste heat from traditional air-cooled data centers as around 30 °C. Air cooling keeps the recovered heat relatively low-grade, so a project connected to a hotter district-heating supply normally needs substantial temperature lift.
Rank #3
- 【Premium Quality】Our plate heat exchanger is made of high quality 316L stainless steel which are brazed together by 99.9% copper at the edges for a reliable and rugged part to form a durable, integral piece that can resist leakage and withstand high pressure and temperature.
- 【Convenient For Use And Energy Saving】Smooth Thread makes a easy, quick, flexible hookup. Highly conductive and super-thin stainless steel plates make good performance and economy for heating transfer and cooling without electricity consumption and oxygen consumption.
- 【Product Parameter】250,000 - 330,000 BTU CAPACITY: Depending on the application, this product can produce 250kBtu to 330kBtu per hour. 30 PLATES; 4"x 12", 1" MPT: 30 brazed plates work to efficiently heat water for your application.
- 【Multiple Applications】AB water heat exchanger offers the highest level of thermal efficiency and durability in a compact & lightweight unit, perfect for domestic water heating, Floor Heating, Snow Melting, District or Zone Heating Systems, Outdoor Wood Furnaces, Hydraulic and Lube Oil Coolers, Radiator Heating, Hydronic Heating, Solar Heating, Wood Boiler.
- 【Product Support】 Quality-focused manufacturing backed by responsive support for product questions, selection and installation guidance.
Water-cooled and high-performance-computing systems
Liquid cooling can provide warmer water. The Darmstadt high-performance-computer case reported 40–45 °C cooling water, considerably warmer than the approximately 30 °C figure cited for traditional air cooling. That difference can reduce the lift required for a given network connection, although the result still depends on the network’s target and the heat pump.
What’s actually slowing this PC down?
Pick the symptom - the matching free tool is one click away.
Do not compare unlike temperatures
The 25 °C Braunschweig source, the approximately 30 °C air-cooled figure, and the 40–45 °C Darmstadt water are source-side values from different settings. They are not alternative definitions of a district-heating supply temperature. The 70 °C and 60–75 °C figures are network-side examples, and the 120 °C figure is a modeled heat-pump delivery limit in one study.
A practical method for finding the required temperature
A feasibility study should establish the target from the network outward rather than assume a standard number.
Rank #4
- High-Quality Materials: The entire unit is copper brazed at edges and contact points, forming a durable and leak-resistant piece that withstands high pressure and temperature.
- Durable and Corrosion-Resistant: Features epoxy-coated fins, providing high hardness, wear resistance, and corrosion protection. This reduces internal water vapor scaling, promoting maximum heat exchange between air and fins. Suitable for operating temperatures of -40-356℉ / -40-180°C.
- Efficient Heat Transfer: The heat exchanger generates up to 160kBtu per hour, with 12 aluminum fins per inch and 3 rows of 3/8" seamless copper tubes. The threaded copper tubes increase the contact area and capacity of the fluid medium, significantly enhancing the heat exchanger's performance.
- Large Heat Exchange Area: With an effective heat exchange area of 18”x20” and 242 fins, this heat exchanger provides excellent heat transfer performance to meet various needs.
- Tight and Leak-Proof: To eliminate the possibility of micro-leaks, the heat exchanger uses high-pressure vacuum brazing and undergoes rigorous leak testing, ensuring long life and high reliability.
- Measure the source over time. Record entering and leaving cooling-loop temperatures, flow rate, available heat, and how those values change with IT load and outdoor conditions. A single spot measurement can overstate what is available year-round.
- Identify the physical connection point. Ask the district-heating operator whether heat will enter a supply line, a return line, or a separate low-temperature branch. Obtain the required inlet temperature, allowable return temperature, pressure, flow range, metering rules, and control sequence.
- Calculate the temperature lift. Compare the measured source temperature with the network temperature required at the heat exchanger. Use the coldest expected source condition and the hottest required network condition for conservative design, rather than average values alone.
- Select and model the heat pump. Evaluate capacity, coefficient of performance at the actual lift, part-load behavior, outlet temperature, defrost or auxiliary-heat needs where relevant, and redundancy. A high-temperature unit capable of 120 °C in a model is not automatically suitable for a specific project.
- Match heat production to heat demand. Compare hourly and seasonal data-center availability with the network’s demand. Include summer periods when waste heat may exceed demand and winter periods when the data center may not cover the district’s peak load.
- Price the complete connection. Include heat-pump capital cost, electrical service, heat exchangers, controls, metering, pipework, network extension, civil works, maintenance, and backup or peak-generation capacity.
- Confirm operating and legal requirements. The network owner must approve water quality, isolation, safety, control, and reliability arrangements. Regulatory rules differ by jurisdiction and can change; obtain current advice before committing to a project.
What determines whether the temperature match is economical?
Electricity price and heat-pump investment
Electricity is the operating input that drives the temperature lift. DTU identifies electricity prices and heat-pump investment costs as major determinants of project economics. A technically achievable 70 °C or 90 °C outlet can still be uneconomic if the required lift produces high electricity consumption or if the equipment is lightly used.
Operating hours and seasonal mismatch
IEA DHC material notes that low-grade heat-pump projects need enough annual operating hours to recover their investment. Data centers often produce heat continuously, while district-heating demand varies strongly by season. In summer, available waste heat may exceed demand; in winter, it may not cover the network’s peak load. Storage, another heat source, or a conventional peak plant may be needed.
The Tool Desk
Outbyte Driver Updater FREEFix the driver behind crashes, sound loss and screen glitchesFind Drivers →Outbyte PC Repair FREEClear out junk files and repair common Windows errorsFree Scan →Connection distance and network expansion
Long pipe runs and reinforcement of the receiving network can dominate the budget even when the heat source is nearby on a map. DTU lists connection or expansion costs among the major economic variables. The cheapest temperature target is not useful if reaching the approved connection point requires disproportionate construction work.
Best Value
- Excellent Quality: This brazed plate heat exchanger is made of high-quality SS316L stainless steel, brazed with copper in a vacuum environment, ensuring a reliable and robust component. It offers superior resistance to high temperatures, high pressures, corrosion, and leaks, playing an excellent role in supporting various refrigeration, heating, high-temperature, and high-pressure industrial fields.
- Heat-transfer Efficiency increased by 99%: The heat exchanger adopts a fishbone corrugated design, which increases the intensity of the turbulence and creates various support points that reduce the secondary side pressure, resulting in a rapid increase in channel heat transfer efficiency by 99%.
- Convenient to Use and Energy Saving: The smooth threads allow for quick and flexible disassembly and installation. Ultra-thin stainless steel plates provide excellent performance and economy in heating and cooling, improving energy efficiency and reducing operating expenses.
- Product Parameter:Mode WHE4X12-20P can produce up to 275000 btu per hour depending on different applications, 5.6 sq.ft heat transfer area，4"x12"-20 plates with 1"MPT.
- One-year limited warranty: The stainless steel heat exchanger provides exceptional thermal efficiency and durability in a compact, lightweight design and ALORAIR offers a one-year limited warranty covering manufacturing defects.
Source stability and quality
Designers need a stable flow of heat, not merely a high maximum temperature. Server-load changes, maintenance outages, cooling redundancy, and planned expansion affect how much heat can be contracted. The heat exchanger also keeps the data-center and district-heating fluids separate, so compatibility, fouling control, and maintenance access must be addressed in the design.
Interpreting the 120 °C and emissions figures correctly
The 2024 study by Pengtao Wang and coauthors modeled high-temperature heat-pump configurations delivering heat up to 120 °C. That number indicates what the studied configurations were modeled to achieve; it does not establish a 120 °C requirement for district heating, nor does it guarantee that every heat pump or network can operate there.
The same ORNL-indexed study estimated that a one-megawatt high-temperature heat pump could reduce emissions by approximately 33,100–33,200 metric tons of CO2 per year, equivalent in that study to 85.4–85.6% of emissions from natural-gas boilers. These are modeled results tied to the study’s assumptions and comparison baseline. They are not a guaranteed reduction for a future installation; actual results depend on electricity generation, operating hours, source temperature, network dispatch, and the displaced heat source.
Policy context: verify the rule where the project is built
DTU’s 1 November 2022 explainer discussed Danish rules and European policy proposals, including a proposed cost-benefit-analysis requirement for data centers. Those comments describe the policy discussion at that date and in that jurisdiction. They should not be read as current global law. A project developer should check the latest national, regional, and municipal requirements with the network operator and qualified legal or regulatory advisers.
Decision rule for developers and network operators
Start with the network operator’s written temperature and hydraulic requirements, then work backward to the data center’s measured source conditions. If the source is around 25–30 °C and the network asks for roughly 70 °C supply, a heat pump is the normal enabling technology, as the Braunschweig example illustrates. If a liquid-cooled system provides 40–45 °C water and the connection is to a 60–75 °C return circuit, the required lift may be smaller, as in the Darmstadt case.
The project is viable only when the heat pump, connection, electricity supply, annual operating hours, seasonal demand profile, and peak-load strategy work together. Temperature is the starting specification—not a standalone pass/fail number.
Quick Recap
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
Recommended Free Tools
