Exhaust air heat pump S735C

residentialfor indoor installationsplit

Product information
The NIBE S735C is an exhaust air heat pump with inverter control and an integrated 178 L water heater. It provides heating, cooling, hot water and ventilation in a single compact unit. The built-in cooling function reduces indoor temperature in summer periods, while the inverter control adapts output automatically to building demand. The unit uses a natural refrigerant to minimise environmental impact.

Additional product details
Designed for new builds and suitable for replacement installations. Compact dimensions and low noise level facilitate placement and installation. High seasonal performance reduces operating costs. Compatible with NIBE supply air modules for combined exhaust and supply air ventilation solutions.

Connectivity and comfort
Integrated Wi‑Fi and compatibility with wireless accessories enable remote control and monitoring. Smart control adjusts indoor climate automatically. The unit features a user-friendly touchscreen and wireless connection options for system expansion.

Key features

• Heating, cooling, hot water and ventilation in one unit
• Built-in cooling function for summer comfort
• Inverter-controlled to match heating demand
• Natural refrigerant for reduced environmental footprint
• Integrated Wi‑Fi and support for wireless accessories

Accessories (selected)

• NIBE DKI S10 — Accessory to split the heat pump for installations with low ceiling height (lower part 1500 mm, upper part 674 mm).
• NIBE DEW S42 — Docking kit to connect the S735 exhaust air heat pump to the VPB S200 hot water cylinder; includes AXC control module, diverter valve, shut-off valve, check valve, immersion sensors and pre-configured wiring.
• NIBE DEW S43 — Docking kit (accessory).
• NIBE DKI S20 — Accessory (listed).
• NIBE OEK S20 — Enables mixing outdoor air with exhaust air to increase usable heating capacity and protect system performance.
• NIBE AXC 20 — Accessory control module.
• NIBE SAM S42 — Supply air module to add tempered supply air ventilation; includes water-to-air coil, buffer vessel and circulation pump.
• NIBE TOC 40 Top cabinet series — Top cabinets to conceal ventilation ducting and services; available in fixed and adjustable heights.
• NIBE PV — Modular solar solution to combine with NIBE heat pump systems.
• NIBE HTS 40 — Sensor accessory for humidity and temperature recording.
• NIBE RMU S40 — Room unit with 2.8” touch display and built-in sensors for remote control.
• NIBE ECS 41 / ECS 40 — Kits for additional heating circuits or multi-climate system management.

Documents
Refer to product page for user manual, installer manual, product leaflet, energy labels and consumer information leaflet (files listed on the page).

Technical specifications

• Height (mm): 2125
• Width (mm): 600
• Depth (mm): 620
• Net weight (kg): 216
• Product efficiency class room heating, 35 °C: A+++
• Product efficiency class room heating, 55 °C: A+++
• System efficiency class room heating, 55 °C: A+++
• System efficiency class room heating, 35 °C: A+++
• Volume water heater (L): 178
• Declared tap profile: XL