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Heat Pumps

Best geothermal heat pumps July 2026

A geothermal heat pump is a major investment that provides highly efficient heating and cooling for your home. This guide helps you compare the best options on the market right now. We'll look at key features like energy efficiency and heating capacity to help you find the right model for your needs, based on our independent ranking.

Last updated: 25 June 2026

The list is unchanged since the last update.

Heat Pumps: Top 5

1

CTC EcoPart i600M i608M

This wall-mounted geothermal heat pump from CTC includes an indoor unit and offers high energy efficiency. With a Seasonal Coefficient of Performance (SCOP) of 5.6, it's a strong choice for homeowners focused on reducing long-term energy consumption.

The CTC i608M has a slightly lower SCOP rating than the Nibe models but is still a very efficient unit. A key difference is that this pump does not offer smart app compatibility, a feature found on the Nibe S1256 series.

Pros

  • High energy efficiency (SCOP 5.6)

  • Space-saving wall placement

  • Includes indoor unit

Cons

  • Lacks smart app control

  • No available user reviews

2

CTC EcoPart i600M i612M

Part of CTC's EcoPart i600M series, this model offers a solid balance of performance and features. It provides good efficiency with a SCOP of 5.5 and comes as a complete package with an indoor unit designed for wall mounting.

The primary difference is a slight variation in efficiency. The i612M has a SCOP of 5.5, while the i608M is slightly higher at 5.6. Otherwise, their core design and features are very similar.

Pros

  • Good energy efficiency (SCOP 5.5)

  • Space-saving wall placement

  • Comes with an indoor unit

Cons

  • Slightly less efficient than the i608M

  • No smart app control feature

  • No available user reviews

3

CTC EcoPart i600M i616M

The CTC EcoPart i616M offers the same efficiency as the i612M model, with a SCOP of 5.5. As a wall-mounted unit that includes the indoor component, it provides a reliable heating solution without requiring floor space.

Based on the provided data, it shares the same 5.5 SCOP rating as the i612M. The main differences between models in the i600M series typically relate to their maximum heating capacity, which isn't specified here.

Pros

  • Efficient performance (SCOP 5.5)

  • Wall-mounted for flexible installation

  • Includes indoor unit

Cons

  • Less efficient than the top-ranked model

  • Lacks smart app control

  • No available user reviews

4

Nibe S1256 18kW

The Nibe S1256 is a high-performance geothermal heat pump built for larger homes with significant heating requirements. It delivers an outstanding SCOP of 6.22, a powerful 18 kW capacity, and includes the modern convenience of smart app control.

An 18 kW capacity is quite powerful and generally intended for very large or poorly insulated properties. For a typical, well-insulated home, this model would likely be oversized and therefore less cost-effective to run.

Pros

  • Excellent efficiency (SCOP 6.22)

  • High heating capacity (18 kW)

  • Controllable via smartphone app

Cons

  • 18 kW may be excessive for smaller homes

  • No user reviews available

5

Nibe S1256 8kW

This 8 kW version of the Nibe S1256 series is an excellent choice for average-sized homes. It provides exceptional efficiency with a very high SCOP of 5.95 and offers the convenience of smart app compatibility for remote control.

The 8 kW model is ideal for most standard, well-insulated homes. You should only consider the 18 kW version if you have a very large property or one with unusually high heating demands.

Pros

  • Very high efficiency (SCOP 5.95)

  • Compatible with control app

  • Suits average-sized homes (8 kW)

Cons

  • Not suitable for very large properties

  • No available user reviews

Compare specifications

CTC EcoPart i600M i608M
1
CTC EcoPart i600M i608M
CTC EcoPart i600M i612M
2
CTC EcoPart i600M i612M
CTC EcoPart i600M i616M
3
CTC EcoPart i600M i616M
Nibe S1256 18kW
4
Nibe S1256 18kW
Nibe S1256 8kW
5
Nibe S1256 8kW
TypeGeothermal Heat PumpsGeothermal Heat PumpsGeothermal Heat PumpsGeothermal Heat PumpsGeothermal Heat Pumps
Nominal heating capacity———18 kW8 kW

How we create the list

The ranking is updated monthly and is based on data we collect from our own platform. Products that rank highly are popular among our users while also maintaining high quality according to editorial expert assessments. Specifically, we weigh how many users follow the product via price alerts or lists, how it is rated by experts and users, as well as how much traffic it generates to stores and how well it is represented in retail. The texts on this page are AI-generated and created to give you a quick and clear overview. No products are paid placements – the ranking is driven solely by data.