A pool heat pump is an energy-efficient system that uses electricity to capture heat from the surrounding air and transfer it into your pool water. Unlike traditional gas heaters, it doesn’t generate heat directly, making it more cost-effective and eco-friendly.

Solar heating depends on sunshine and can’t always guarantee consistent temperatures, while gas heaters are fast but costly to run. A heat pump offers the best balance — reliable year-round heating with significantly lower running costs.

The right size depends on your pool volume, location, and how often you plan to swim. Smaller residential pools may need an 18–32kW unit (Apollo or Solara Series), while large commercial pools or resorts often require 60–250kW (Aquilo Series).

Yes. Heat pumps can be paired with solar PV systems to offset electricity use. Many owners use their excess solar energy to run their heat pump during the day, further reducing operating costs.

Heating times vary based on pool size, water temperature, and weather. Typically, it can take 1–3 days for an initial heat-up, after which the heat pump maintains your desired temperature efficiently.

Most popular temperature is 28°C

Apollo Series (18–32kW, front discharge): High-performance units for residential pools.

Solara Series (18–32kW, side discharge): Compact, quiet, and flexible for tighter spaces.

Aquilo Series (60–250kW): Heavy-duty, commercial-grade units for resorts and large pools.

Both Apollo and Solara Series are ideal for home pools, depending on your installation space. Apollo offers front-discharge power, while Solara provides compact, side-discharge flexibility.

The Aquilo Series iOX is purpose-built for commercial applications, with outputs ranging from 60kW to 250kW for large pools, aquatic centres, and resorts.

Yes. Every Grannus heat pump includes a user-friendly LCD display, making it easy to set and monitor your pool’s temperature.

COP stands for Coefficient of Performance. A COP22 rating means the unit can produce up to 22 units of heat for every 1 unit of electricity consumed, making it highly efficient and cost-effective compared to traditional heaters.

Heat pumps are one of the most efficient ways to heat a pool, offering significant savings compared to gas heaters and more reliable performance than solar-only systems.

Yes. Modern Grannus heat pumps are designed to work efficiently even in cooler conditions and can operate day or night. Performance may vary depending on outside temperature, but the system will still heat the pool.

Savings depend on pool size and usage, but many customers experience up to 40% lower annual heating costs compared to gas heating, especially when paired with solar PV systems.

Front-discharge units (Apollo Series) are ideal for open spaces, while side-discharge models (Solara Series) are designed for tighter or enclosed areas. Proper airflow clearance is essential for both.

Clearance requirements vary by model, but typically allow for at least 500–1000mm around the unit for ventilation and servicing access. Your installer can provide specific recommendations

Yes, though maintenance is minimal. Regularly check air inlets/outlets for obstructions, ensure water flow is clean, and schedule an annual service to keep your unit running at peak efficiency.

Grannus provides full product support, including warranty coverage, technical advice, and service assistance to keep your heat pump running smoothly

In most cases, yes. Grannus units can be integrated into existing filtration and circulation systems with minimal adjustments.

All Grannus heat pumps are backed by a manufacturer’s warranty covering both parts and labour. Warranty length varies by series — check product specifications for details.

We offer ongoing technical support, spare parts, servicing, and professional advice to ensure long-term performance.

With proper care and maintenance, a Grannus pool heat pump can last 10–15 years or more, depending on usage and conditions.

Our support team is available via phone or email to help with troubleshooting, servicing, and warranty enquiries.