Heat Pump Water Cylinders
Air Source Heat Pump Cylinders
Alto Energy supplies a comprehensive range of heat pump hot water cylinders, including McDonald water storage cylinders and Mitsubishi pre-plumbed units, ensuring the right solution for a wide range of system designs and installation requirements.
The McDonald range is available in standard, slimline, solar, and horizontal configurations, offering flexibility for different plant room layouts. Designed and manufactured in the UK, each cylinder is built for long-term durability and comes with a 25-year warranty as standard, supplied complete with a full unvented hot water safety kit for straightforward installation and compliance.
We also supply Mitsubishi pre-plumbed hot water cylinders designed to integrate seamlessly with Mitsubishi Ecodan air source heat pumps, enabling fast installation, reduced labour time, and reliable system performance across new build and retrofit projects.
Through our MCS Umbrella Scheme, we design complete heat pump systems for each project and recommend the most suitable hot water cylinder to ensure optimal efficiency, compliance, and performance.
Product Range
Hot Water cylinders We Supply
Pre-Plumbed Cylinders
High-performance pre-plumbed hot water cylinder designed to integrate seamlessly with Mitsubishi Ecodan air source heat pumps. Available in a range of capacities and formats, ideal for fast, efficient installation across new build and retrofit projects.
Heat Pump Cylinders
High-quality hot water storage cylinders designed and manufactured in the UK, built with heat pumps in mind. Supplied complete with unvented safety kits and designed for straightforward installation, with a wide range of standard, slimline, solar, and horizontal models available.
Pre-Plumbed Hot Water Cylinders
Mitsubishi Pre-Plumbed Cylinder
High-efficiency pre-plumbed cylinder solutions designed for seamless integration with Mitsubishi heat pumps, delivering reliable performance, simplified installation, and consistent hot water supply across residential and commercial projects.
Standard
- ERP Rating: B-C (depending on size)
- Standing loss: 1.15 - 2.06 kWh/day (varies by capacity)
- Available sizes: 150L / 170L / 210L / 250L / 300L
- Connection options: 22mm or 28mm (availability varies by size)
Slimline
- ERP Rating: C
- Standing loss: 1.4 - 1.59 kWh/day (varies by capacity)
- Available sizes: 150L / 170L
Heat Pump Hot Water cylinder
McDonald Air Source Heat Pump Cylinders
Available in standard, slimline, solar, and horizontal configurations, McDonald products offer exceptional installation flexibility to suit varied plant room and space requirements. Designed and manufactured in the UK, each cylinder is built for long-term durability and comes with a 25-year warranty as standard. Supplied with a full unvented hot water safety kit, these systems ensure straightforward installation.
Standard
- ERP Rating: B–C (depending on size)
- Standing loss: 1.32–1.85 kWh/day (varies by capacity)
- Available sizes: 150L / 180L / 200L / 250L / 300L
Slimline
- ERP Rating: C
- Standing loss: 1.53–1.80 kWh/day (varies by capacity)
- Available sizes: 150L / 180L / 200L
Solar
- ERP Rating: Not specified
- Standing loss: Not specified
- Available sizes: 200L / 250L / 300L / 400L / 500L
Horizontal
- ERP Rating: B-C (depending on size)
- Standing loss: Not specified
- Available sizes: 180L / 215L / 250L / 300L / 400L