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Alto Energy Limited

Alto Energy Limited

4.9(215 reviews)See reviews ↓·Oxford

What customers say

Based on genuine customer reviews

From the first enquiry through to commissioning, the delivery of air source and ground source heat pump projects is described as professional and well organised. Customers repeatedly highlight the company's expertise in sizing equipment, calculating cylinder requirements and managing the associated MCS paperwork, which removes much of the stress from a complex switch away from gas heating. Materials are said to arrive when promised, and the support team is praised for responding promptly, including calling back when installers are on site.

Named engineer Ryan Birch is singled out for a first service in which he patiently explained the system and answered numerous questions, while Ashley is described as punctual and thorough, correcting switched flow and return sensors and fine-tuning settings for greater efficiency. Accounts of underfloor heating and full heating installations in and around Oxford mention high standards of workmanship across surveying, plumbing and commissioning, alongside advice valued during a rebuild project. Reviewers note warmer homes, lower energy usage and improved hot water performance, with several mentioning guidance offered throughout lengthy renovation work and the recycling of an old ground source unit after seventeen years of service.

Heating equipment supplier
Alto Energy Limited — Customer photo
Alto Energy Limited — Customer photo
Alto Energy Limited — Customer photo

Reviews

Reviews are taken from publicly available sources.

AH
alex howard27 May 2026

Alto have been absolutely superb from start to finish during the process of installing an underfloor heating system and air source heat pump. Every member of the team that I have dealt with have been the utmost professionals and were always more than happy to answer questions and give guidance throughout the process of a stressful rebuild project. I would highly recommend Alto

S
Sharne14 May 2026

Had my first heat pump service yesterday with engineer Ashley. He arrived on time and was very professional. He explained what he had done and corrected an error (flow and return sensors switched) by the installers (different company). He also amended the settings so the system runs more efficiently.

KP
Kevin Perkin8 May 2026

We have been a customer for many years and have just had our Ground Source Heat Pump renewed after 17 years. Alto Energy specified, supplied and managed the installation of the new heat pump and the recycling of the old. At all times they were helpful, professional and friendly.

AV
Ashley Venton13 April 2026

Alto Energy are an extremely professional company. They make installing air source heat pumps very easy, taking away all the stressful side of the job. Alto Energy calculate the size of the heat pump and cylinder. They take care of all the MCS paperwork. Materials for the job are always delivered on time and their very knowledgeable support team always call you back when you're on site. I would not hesitate to recommend Alto Energy to any heating company looking to start installing heat pumps!

NM
Neil Milmine1 April 2026

My IVT ground source heat pump was desperately in need of a service and repair. Searching for a solution I was referred to Alto Energy who are authorised IVT agents. Concerned that my heat pump might be beyond reasonable repair they reassured me that it could be repaired and within days their servicing technician visited. He identified that the external sensor was faulty and replaced it, topped up the ground loop with antifreeze and the water system with rust inhibitor, replaced two or three out-of-spec components, and then set up all the parameters to sensible ones. He patiently talked me through everything. And now, the heat pump is quieter and fully effective. I am so pleased I discovered Alto Energy and the really helpful and knowlegeable technician who came to get things going well.

AB
Adrian Burton27 March 2026

I employed Alto’s services for a new build project requiring Air Source heat pump and under floor heating. I’d spoken to other companies but they didn’t fill me with confidence in terms of the calculations and recommendations, whereas Alto did. All through the process from design, installation, commissioning and claiming the grant the people I engaged with were very personable and professional. I would definitely recommend and use them again.

RH
Richard Holloway26 February 2026

Alto Energy provided a fantastic service from the first telephone contact to the completion of a complete Air Source Heating system. All my fears and enquiries were dealt with promptly and professionally at all times. All the surveyors and plumber engineers provided a very high standard of work throughout and I now have a really toasty home with no cold areas any longer. I would and will recommend Alto Energy Ltd to one and all. Richard Holloway

Heat pump installers in Oxford compared

Ordered by rating, weighted by the number of reviews — businesses with only a handful of reviews do not jump to the top automatically. 5 businesses in this category in Oxford are compared.

RankProviderRatingReviewsOpen Sat.
1The Southern Heat Pump Specialist Ltd★ 5,077No
2Alto Energy Limited (this page)★ 4,9215No
3Oxyplumb Domestic & Commercial Boiler Engineers★ 4,9307No
4JGC Plumbing, Heating and cooling Ltd★ 4,942Yes
5Oxon Energy Ltd★ 4,841No
Contact
+441993220699www.altoenergy.co.ukOrchard Works, Carterton Industrial Estate, Black Bourton Rd, Carterton OX18 3EZ
Working hours
Monday09:00–17:00
Tuesday09:00–17:00
Wednesday09:00–17:00
Thursday09:00–17:00
Friday09:00–15:30
SaturdayClosed
SundayClosed