Compact Ground Source Heat Pumps
Ground Source Heat Pump Supplier
Alto Energy is a ground source heat pump supplier for heating engineers, developers and homeowners across the UK. We specialise in Viessmann ground source heat pumps, providing system design, equipment supply, MCS certification, technical support and commissioning to help deliver reliable, efficient installations.
Whether you're an installer looking for equipment and support for your next project, a developer specifying ground source heating for a new build, or a homeowner replacing an existing heating system, we can help design the right system and provide the support you need from initial design through to commissioning and certification.
Product Range
Ground Source Heat Pumps We Supply
We supply ground source heat pumps from Viessmann, with different systems and output ranges available to suit a range of heating requirements and property types.
Vitocal 200-G
High-performance ground source heat pump available from 6kW to 17kW. Ideal for underfloor heating or existing radiator systems. Flexible design integrates with separate domestic hot water cylinders.
Vitocal 222-G
Compact ground source heat pump with integrated 220-litre cylinder. Available in 6kW, 8kW and 10kW single phase. Maintains strong performance at both low and higher flow temperatures with minimal installation complexity.
Why Alto Energy
More than a ground source heat pump supplier
We've been supplying and supporting heat pump projects since 2017. Here's what that means in practice:
MCS Certified
Every installation we're involved in is MCS certified. Installers can operate under our Alto Assured Umbrella Scheme without holding their own accreditation. MCS certification is a requirement for schemes like the Boiler Upgrade Scheme.
In-House System Design
Our design team size every system with your property in mind. Correct heat loss calculations, the right product for the project — not just a box off the shelf. We provide design support for installers, developers, and homeowners.
Commissioning On Every Project
Alto commissions every heat pump system supplied through our partner network using our own nationwide team of engineers. This hands-on approach ensures every system is set up to perform exactly as specified, delivering optimal efficiency, lower energy use, and fewer call-backs.
Long-Term Service & Support
Dedicated in-house engineers, warranty plans, and aftersales that doesn't disappear after handover. We also service systems we supply and systems we didn't.
The Process
From Enquiry to Commissioned System
Whether you're an installer, developer, or homeowner — this is what working with Alto looks like.
Get in touch
Tell us about your project — size, property type, existing systems, and any constraints.
System design
Our team run heat loss calculations and specify the right unit, cylinder, and controls.
Supply & install
Product is supplied direct from our warehouse to site. We coordinate delivery and installation.
Commission & certify
We commission the system and register the MCS certificate, enabling Boiler Upgrade Scheme claims where applicable.
