Collection: Buffer Tanks

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Installing a buffer tank alongside a heat pump protects the compressor from short cycling, stabilises flow temperatures and extends the working life of the system — and our range covers every common installation requirement. With stainless steel and insulated options from 60L to 500L, plus a complete fitting pack, everything needed to commission the buffer side of a heat pump system is available here. Shop now. Should you wish to compare your renewable options, do browse our air source heat pumps, ground source heat pumps, and solar thermal kits.

Cool Energy 500L Buffer Tank

Cool Energy 500L Buffer Tank

Vendor:
Cool Energy

Regular price £1,920.95 GBP

Regular price Sale price £1,920.95 GBP
Unit price per
Cool Energy 200L Buffer Tank

Sale

Cool Energy 200L Buffer Tank

Vendor:
Cool Energy

Regular price £1,105.95 GBP

Regular price ~~£1,134.95 GBP~~ Sale price £1,105.95 GBP
Unit price per

Sale
Cool Energy 120L Stainless Buffer Tank

Cool Energy 120L Stainless Buffer Tank

Vendor:
Cool Energy

Regular price £603.95 GBP

Regular price Sale price £603.95 GBP
Unit price per
Cool Energy 60L Stainless Buffer Tank

Cool Energy 60L Stainless Buffer Tank

Vendor:
Cool Energy

Regular price £475.95 GBP

Regular price Sale price £475.95 GBP
Unit price per
Cool Energy Buffer Tank Fitting Pack

Cool Energy Buffer Tank Fitting Pack

Vendor:
Cool Energy

Regular price £99.95 GBP

Regular price Sale price £99.95 GBP
Unit price per

FAQs

Why do homeowners upgrading to heat pumps invest in a buffer tank at the same time? A buffer tank is the natural companion to a heat pump installation — and for good reason. Heat pumps work best when they operate in longer, steadier cycles rather than frequent short bursts. Adding a buffer tank gives the system greater thermal mass to work with, smoothing out those cycles and allowing the heat pump to perform exactly as it was engineered to. For homeowners making a significant investment in low-carbon heating, a buffer tank is the piece that brings the whole system together.

How does a buffer tank protect one of the most expensive components in a heating system? Here's a fact many people don't realise: a heat pump's compressor is both the hardest working and most costly component in the system — and repeated short-cycling is one of the fastest ways to wear it out. A buffer tank acts as a thermal cushion between the heat pump and the rest of the system, reducing the number of start/stop cycles the compressor must endure. The result is a quieter, more efficient system with a significantly extended operational lifespan.

What makes stainless steel the material of choice for premium buffer tanks? Stainless steel has long been favoured in demanding engineering environments for very good reason — it resists corrosion, handles thermal cycling with ease, and retains its structural integrity over decades of continuous use. In a hydronic heating system, where the tank is constantly in contact with circulating water under varying pressures and temperatures, this matters enormously. A stainless steel buffer tank is built to last the lifetime of the heating system it supports, with no compromise on performance.

Why are buffer tanks becoming a standard feature in high-spec UK home heating systems? The UK's shift towards heat pump technology has fundamentally changed what a well-designed heating system looks like. Buffer tanks have moved from a specialist add-on to an expected part of any quality installation — particularly in homes with multiple heating zones, underfloor heating, or mixed emitter setups. As the standards for modern home heating continue to rise, the buffer tank has become a mark of a system that's been designed properly, rather than simply installed.

What are the installation advantages that make buffer tanks so versatile? One of the most appreciated qualities among heating engineers is how adaptable a well-designed buffer tank is. Whether the plant room is compact or generous, the ability to install wall-hung, freestanding, or stacked above or below a hot water cylinder opens up a wide range of configurations. Multiple connection ports mean the tank integrates cleanly with virtually any system layout — giving architects, engineers, and homeowners the flexibility to design around the space rather than the other way around.

What makes a buffer tank a rewarding purchase beyond the technical specification? There's something deeply satisfying about a heating system that just works — quietly, efficiently, and without the fluctuations that remind you it's there. A buffer tank is one of those purchases that you feel in the quality of your home environment rather than see on a spec sheet. It's the detail that separates a good installation from an exceptional one, and it's why homeowners who understand their systems tend to view it not as an optional extra, but as an essential part of doing things properly.

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Collection: Buffer Tanks

Cool Energy 500L Buffer Tank

Cool Energy 500L Buffer Tank

Cool Energy 200L Buffer Tank

Cool Energy 200L Buffer Tank

Cool Energy 120L Stainless Buffer Tank

Cool Energy 120L Stainless Buffer Tank

Cool Energy 60L Stainless Buffer Tank

Cool Energy 60L Stainless Buffer Tank

Cool Energy Buffer Tank Fitting Pack

Cool Energy Buffer Tank Fitting Pack

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Collection: Buffer Tanks

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