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PRODUCTS | HIGH-VOLTAGE HEATING
High Voltage Coolant Heater for Electric Vehicles
High-voltage PTC coolant heating for battery preconditioning, cabin comfort and reliable cold-climate operation in electric buses, trucks and off-highway machinery.
Explore EVLINK high voltage coolant heaters for battery preheating, cabin heating and commercial EV thermal management. Compare power, voltage and integration options
Vehicle-ready coolant heating designed around the electrical, hydraulic and control requirements of each platform.
HVCH PRODUCT SELECTION
Find the Right High Voltage Coolant Heater by Power and Voltage
Start with the required heating power and the vehicle voltage platform. Final model selection must also consider coolant conditions, ambient temperature, warm-up target, installation space and CAN strategy.
Before selecting a model, review the high-voltage and low-voltage supply requirements. Confirm the electrical interfaces and operating modes for the selected heater configuration.
For multi-heater planning, review the vehicle power budget and control responsibilities; confirm support for the selected hardware and software before assuming a combined output.
LIGHT / MEDIUM DUTY
6–18 kW
A selection pathway for battery preheating, cabin support and smaller commercial-vehicle thermal loops.
HEAVY COMMERCIAL
20–25 kW
For demanding duty cycles where heating load, low-temperature operation and available package space must be reviewed together.
HIGH-POWER DUTY
30–35 kW
For heavy-duty platforms and project-specific thermal requirements. Model availability and rated conditions require engineering confirmation.
NOT SURE?
Let EVLINK Calculate the Heating Demand
Send vehicle type, coolant flow, inlet temperature, target temperature, warm-up time and ambient conditions.
Why Rated Conditions Matter
Heating power is not a standalone number. Ask for the rated voltage, coolant type, flow rate, inlet temperature and ambient condition used to define the kW value. Nominal platform voltage must be distinguished from the complete operating-voltage range.
Electrical estimate: current is approximately power divided by voltage. Actual cable, connector, fuse and control-device selection must use the released product data and vehicle requirements.
How to Size a Coolant Heater Without Guessing
Heater sizing is where projects quietly go wrong. Pick too small and the bus leaves the depot with a cold pack and a driver running the defroster on hope. Pick too big and you have paid for kilowatts the vehicle will never use, in a box that fights for space it did not need.
Start with the coldest morning the vehicle actually sees, not the coldest morning in the brochure. Then count what the heater has to serve: battery preconditioning before departure, cabin heat on route, or both at once. A heater that only warms the cabin is a different size from one that has to lift a cold-soaked pack to working temperature before the first passenger boards.
Our range runs from 15 to 35 kW on platforms up to DC 870 V, and we have been building these heaters in volume since 2021. Big vehicles stack them: six 35 kW units on one truck give 210 kW of heating where a single heater cannot reach. That sounds like a lot until you are the fleet manager watching a −30°C start.
Send us the vehicle type, pack size and your lowest operating temperature. We will run the numbers with you and size the heater once, correctly.
SELECT VOLTAGE PLATFORM
Confirm the Full Vehicle Operating Window
Choose the nominal platform below, then provide minimum, nominal and maximum DC voltage. EVLINK will confirm a compatible released configuration.
400 V Platform
Provide minimum, nominal and maximum pack voltage. Availability is confirmed by released model.
600 V Platform
Match the complete operating window—not only the nominal vehicle voltage.
800 V Platform
Confirm maximum voltage, current, connector, insulation and control requirements.
Custom HV Range
For platform-specific voltage windows and interface requirements reviewed by EVLINK engineering.
Information Needed for an Accurate Match
Vehicle/application · required kW · min/nominal/max HV · 12/24 V supply · coolant and flow · inlet/target temperature · ambient range · installation envelope · CAN requirements.
15–35 kW
Operating voltage: 400–1100 V DC
Q3 Series · CAN + enable control
15–35 kW
Operating voltage: 400–1100 V DC
Q1 Series · CAN + enable control
15–35 kW
Operating voltage: 400–1100 V DC
Q2 Series · CAN + enable control
15–35 kW
Operating voltage: 400–1100 V DC
Q4 Series · CAN + enable control
6–18 kW
Operating voltage: 400–800 V DC
A5 Series · CAN + enable control
20–24 kW
Operating voltage: 400–800 V DC
B2 Series · CAN + enable control
20–24 kW
Operating voltage: 400–800 V DC
E Series · Thermostat control
2–12 kW
Operating voltage: 200–800 V DC
Z Series · CAN + enable control
15–35 kW
Operating voltage: 400–1100 V DC
Q3 Series · CAN + enable control
15–35 kW
Operating voltage: 400–1100 V DC
Q2 Series · CAN + enable control
15–35 kW
Operating voltage: 400–1100 V DC
Q4 Series · CAN + enable control
15–35 kW
Operating voltage: 400–1100 V DC
Q1 Series · CAN + enable control
6–18 kW
Operating voltage: 400–800 V DC
A3 Series · CAN + enable control
5–14 kW
Operating voltage: 400–1000 V DC
H2 Series · CAN + enable control
5–14 kW
Operating voltage: 400–1000 V DC
H Series · CAN + enable control
6–18 kW
Operating voltage: 400–800 V DC
A4 Series · CAN + enable control
6–18 kW
Operating voltage: 400–800 V DC
A5 Series · CAN + enable control
20–24 kW
Operating voltage: 400–800 V DC
B4 Series · CAN + enable control
20–24 kW
Operating voltage: 400–800 V DC
B2 Series · CAN + enable control
6–18 kW
Operating voltage: 400–800 V DC
A3 Series · CAN + enable control
BUYER COMPARISON
Compare Models Using Decision-Critical Data
Compare the heating power and operating-voltage range on each card, then check the series details for interfaces and installation requirements. These are family ranges: the selected power, nominal voltage and full operating window must be confirmed together for your vehicle.
Compare mounting, coolant ports and connector layouts as well as electrical control. The E series uses thermostat control; its supplied parameter table does not list an external communication interface. Confirm the interface and released drawing for the exact ordered configuration.
Electrical
Rated power; nominal, minimum and maximum HV input; LV supply; current limits; pre-charge; HVIL.
Thermal & Hydraulic
Output at defined conditions; inlet/outlet limits; coolant; flow; pressure drop; dry-run logic.
Mechanical
Dimensions; mass; mounting; orientation; port type and direction; connector and harness clearance.
Control & Safety
CAN messages; command modes; feedback; diagnostics; derating; overtemperature and insulation protection.
Environment
Operating and storage temperature; altitude; vibration; ingress protection and duty cycle.
Validation
Test standards, conditions, reports, sample revision, deviations and acceptance criteria.
Commercial
Prototype availability, lead time, MOQ, forecast volume, change control and release status.
APPLICATIONS
High Voltage Coolant Heater Application Pathways
The application page explains duty and system needs; the model page confirms the exact heater configuration.
Electric Bus
Battery conditioning and passenger/cabin heating around repeated route duty.
Electric Truck
Cold-start and battery preconditioning for long-haul and regional duty.
Electric Mining Truck
Heavy-duty heating designed around dust, vibration and extreme operating conditions.
Construction Machinery
Machine-specific coolant heating for off-highway duty and installation constraints.
Agricultural Machinery
Seasonal, cold-start and mixed-duty thermal management for electric machinery.
Energy Storage
Project-specific liquid-loop heating where the released heater configuration is suitable.
ENGINEERING INTEGRATION
From Heater Selection to Vehicle Release
The heater must work inside the vehicle’s complete thermal, electrical and control architecture. EVLINK can review requirements, sizing, package, interfaces, CAN, prototype integration and validation scope.
01 | Requirement Review
Thermal load, voltage, coolant, environment, standards and project timing.
02 | Product Selection
Match a released heater series to the operating window and installation constraints.
03 | Integration & Validation
Close drawings, interfaces, CAN, samples, tests and release documentation.
Q-SERIES VALIDATION
Laboratory Testing for Vehicle Integration Confidence
EVLINK has completed Q-series PTC coolant-heater laboratory validation activities at Shanghai University of Engineering Science (SUES), including the documented vibration-test setup and related water-circulation and powered-performance evaluation.
- Vibration test setup for the Q-series heater
- Water-circulation and powered-performance evaluation
- Project-specific validation scope available for review
Ask our engineers for the applicable validation matrix and available evidence for your selected model and operating conditions.
TECHNICAL INSIGHTS
Plan the Heater Before You Freeze the Package
Use these engineering guides to prepare your heater selection requirements, then review the applicable model specifications with EVLINK.
How to Size an HVCH
Estimate the thermal load, heat-up time and losses before choosing rated power.
HVCH Wiring and CAN
Define HV, LV, HVIL, commands, feedback, faults and control responsibility.
Coolant Flow and Pressure Drop
Understand how circuit conditions affect delivered heating and protection logic.
FREQUENTLY ASKED QUESTIONS
HVCH Selection and Model Page FAQ
Clear answers for engineering, purchasing and program teams.
Provide the vehicle type, heating objective, battery or cabin thermal load, nominal and operating high-voltage range, low-voltage supply, coolant, flow and pressure conditions, target inlet and outlet temperatures, installation space, connectors, CAN requirements, ambient conditions and validation standards.
Only when it is a real released model or a technically distinct series with unique specifications, drawings and buyer value. Do not create near-duplicate pages merely by changing a power or voltage keyword.
It may be possible within a coordinated coolant architecture, but the answer depends on thermal load, circuit topology, valves, pump capacity, control strategy and operating priority. EVLINK should review the system conditions before confirming a model.
Confirm the released model, rated and operating voltage, output at the required coolant conditions, flow direction, pressure drop, coolant compatibility, mounting, HV/LV interfaces, HVIL, CAN messages, protection logic and validation plan.
No. Portfolio-level values describe the overall public range and must not be applied to an individual model without its released datasheet. The exact configuration is confirmed during selection.
Send the project requirement package together with the expected prototype timing and forecast volume. A quotation becomes reliable after the technical configuration and scope are confirmed.
Our high voltage coolant heaters run from 15 to 35 kW per unit, on DC platforms up to 870 V. For vehicles that need more, units work in parallel: six 35 kW heaters deliver up to 210 kW on a single vehicle.
Volume production started in 2021. These are not new prototypes; the current range is the result of several production years on electric buses and trucks, with the control and safety behaviour refined in the field.
Vehicle type, battery capacity, platform voltage and the lowest ambient temperature the vehicle operates in. If the heater also serves cabin heating or defrost, tell us that too. With those four or five inputs, we can name a model instead of sending you a catalogue to decode.
TALK TO EVLINK ENGINEERING
Configure the Right High-Voltage Coolant Heater
Share your operating voltage, power range, coolant flow, inlet temperature, control interface, installation space and validation requirements
Comparing suppliers? See our guide to high-voltage coolant heater manufacturers and the capabilities to verify before an RFQ