A Guide to Heat Pump Cylinders with Integrated Heat Pumps

Heat Pump Cylinders with Integrated Heat Pumps: What You Need to Know

Heat pump cylinders with integrated heat pumps combine water heating and heat pump technology in a single, efficient unit. By merging these technologies the Direct Hot Water heat pumps simplify installation, reduce energy consumption, and create an eco-friendly water heating solution for homes and commercial properties. This guide explains how they operate, highlights their pros and cons, and reviews some top models on the market.

How Heat Pump Cylinders with Integrated Heat Pumps Work

An integrated heat pump cylinder uses ambient air to heat water stored in a built-in tank. It follows a refrigeration cycle process with key components such as an evaporator, compressor, condenser, and expansion valve. This cycle captures heat from the air around it and boosts it to a higher temperature for efficient water heating.

Heat pump water heaters, as they are also known, work best in areas where the surrounding temperature stays between 5°C and 35°C year-round. They also need about 30 cubic meters of open air space around them to operate efficiently. The air drawn through the system can be released either indoors or outside, depending on the installation setup.

Heat pump water heaters cool the air around them, as they move that ambient heat from the air in the room to the water in the cylinder, this means that they aren’t ideal for cold spaces where there isn't enough heat to draw from. Placing them in a warmer area helps them run more efficiently, by taking advantage of the extra heat already present in the surrounding air, but it will mean that it cools the room down. If this is a plant room or utility room, that you use to dry clothes, then it will cool the room down.

Many models of these type of cylinders feature smart controls for precision temperature management and minimising energy waste. Advanced units also support solar PV integration, allowing homes to harness renewable energy and reduce electricity bills further.

Why Choose a Heat Pump Cylinder with an Integrated Heat Pump?

• Energy Savings: These systems use significantly less electricity than standard water heaters by extracting heat energy from the air.
• Space-Efficiency: Combining the heat pump and hot water tank in one unit frees up valuable interior space.
• Lower Utility Bills: Enjoy lower energy bills than direct electric or gas water heaters.
• Eco-Friendly Water Heating: They can lower carbon emissions, contributing to a greener home.
• Simplified Installation: Fewer separate components make installation quicker and easier than a separate heat pump and cylinder.
• Smart Integration: Many models offer remote management through apps and smart home compatibility.

Top-Rated DHW Heat Pumps

Key factors in choosing a Heat Pump Cylinder

• Hot Water Demand: You should select a cylinder size that matches your household's needs.
• Energy Ratings: Look for high-efficiency ratings (A++ and A+++).
• Compatibility: Choose a system optimised for your current or intended heating system, and other measures you may want to integrate (like solar thermal or solar PV). If you plan to bring heating and hot water under one system in the future then you might consider whether it's worth waiting, rather than investing in an integrated heat pump cylinder now and need to change it in the future.
• Budget and Warranty: Consider the price and warranties of the different products. Prices can vary greatly, but you should consider whether the extra money buys enough improvement in efficiency to make it worthwhile, and whether you are comparing products with similar warranties when looking at the prices.
• Noise Factor: Built-in heat pumps can produce a low noise level, so the cylinder's placement in the home should be considered.

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