Views: 0 Author: Site Editor Publish Time: 2025-07-02 Origin: Site
Installing an air to water heat pump is one of the most energy-efficient ways to heat your home. But how long does it actually take to install one — and what factors influence the installation timeline?
Whether you're planning a retrofit or building a new home, this article walks you through the average duration of installation, what happens during each phase, and how to ensure a smooth process.
For a standard residential property, a professional air to water heat pump installation typically takes:
3 to 5 days for a full system including hot water cylinder and underfloor/radiator connections
1 to 2 days for a simple replacement or pre-prepped system
Up to 2 weeks for complex retrofits, especially in older buildings
Here’s what happens during a typical installation, and how long each step usually takes:
Time: 1–2 hours (plus design turnaround)
Heat loss calculations
Sizing and equipment selection
Layout planning (pipework, emitters, buffer tank, cylinder)
This phase ensures your system is tailored to your home’s needs and is MCS-compliant (UK) or code-compliant (US/EU).
Time: 0.5–1 day
Remove old boiler/system (if retrofit)
Modify or upgrade electrical infrastructure
Pre-lay pipework or ducts where needed
Time: 1–2 days
Mount outdoor heat pump unit
Install indoor units (hydrobox, buffer tank, hot water cylinder)
Connect flow/return pipework and sensors
Time: 0.5–1 day
Connect controller, thermostat, sensors
Link to circuit board with RCD protection
Test all electrical connections and safety functions
Time: 0.5–1 day
Pressure testing
Flow rate calibration
Refrigerant system check (if applicable)
Software programming and heating curve optimization
Time: 0.5 day
Show homeowner how to operate system
Provide documentation, warranty, and manuals
Register system for warranty and incentive programs
Retrofit vs. New Build
Retrofitting older homes may require more preparation, pipe rerouting, or insulation upgrades.
System Complexity
Adding underfloor heating or thermal stores increases time compared to radiator-only systems.
Installer Experience
Experienced, certified installers can reduce time and avoid delays due to mistakes.
Weather & Access
Poor weather or limited access to outdoor unit space may delay installation.
Product Availability
Lead times for cylinders, controls, or specialized parts may affect scheduling.
Have your insulation upgraded beforehand
Clear installation zones before the team arrives
Use MCS or F-Gas certified installers
Schedule installation during mild seasons for better access and availability
| Installation Type | Time Estimate |
|---|---|
| New build (pre-planned) | 2–3 days |
| Retrofit with minimal changes | 3–5 days |
| Retrofit with full upgrade | 1–2 weeks |
| DIY installation (not advised) | 2–3 weeks+ (high risk) |
Installing an air to water heat pump typically takes between 3 to 5 days, but that time can vary depending on your home’s layout, insulation, and heating system. With proper planning and a professional installer, you can ensure a smooth and efficient installation process that pays off in energy savings for years to come.
The key to a fast, successful installation? A qualified team, a tailored system, and good pre-install preparation.
