Potterton Ultra Heat

The Potterton Ultra Heat is a state of the art heat only boiler that is ideal for both new build and refurbishment projects.

Suitable for

New Builds

Ultra Heat product image

Single boiler output
12kW, 15kW, 18kW, 21kW & 24kW

Industry-leading choice of flue lengths, bends & accessories
For easy siting anywhere in the home

No pump overrun or permanent live required
Saving time and money on installation

Weighing just 19.5kg, it is currently the lightest boiler available on the UK market*. Its discreet size means the Ultra Heat can fit into a standard kitchen cupboard. Available in outputs of 12kW, 15kW, 18kW, 21kW and 24kW, there is an output for most sizes of property.

The Ultra Heat does not require a pump overrun or permanent live, saving time and hassle during installation. With an industry-leading choice of flue lengths, bends and compatible accessories, it can be sited virtually anywhere in the home. It has front and side access enabling quick and easy servicing and maintenance.

To register a Potterton Ultra Heat boiler online, click here 

Terms and conditions apply.

*As of March 2017

Please note: warranty and purchasing information on this site applies to the UK only. For information on how to buy these products in the Republic of Ireland, please visit Baxi Potterton Myson.

  • Energy Saving Trust Endorsed
  • 2 year warranty* - for peace of mind (*terms and conditions apply. Please visit baxi.co.uk/warranty)
  • 12kW, 15kW, 18kW, 21kW and 24kW  - a model to suit most property sizes
  • Only 19.5kg installer lift weight - the lightest boiler available in the UK** (As of March 2017)
  • Cupboard fit - can be installed discreetly 
  • Easy fit wall mounting bracket - for robust, positive fix and audible lock so you know it's secure 
  • No pump overrun or permanent live required - saves time and money during installation, and minimises disruption for the homeowner 
  • Top central flue - for easy replacement of existing boilers
  •  One metre lead provided - for ease of installation and no need to access to the control box
  • Front and side access - making servicing easier and quicker, with no special tools required
  • Wide choice of flue lengths, bends and accessories for versatile siting
  • Compatible with the Megaflo Eco cylinder - enabling greater fuel savings for hot water, all available from one manufacturer
  • Offers excellent performance under the SAP calculation framework allowing housebuilders to comply with Building Regulations cost-effectively

Potterton Ultra Heat


Units  12  15  18  21   24
Sales code Boiler only 7668243 7668244 7668245 7668246  7668247


Operating mode selector switch with reset  Yes / no Yes  Yes   Yes   Yes    Yes
User adjustable CH temperature  30°C to 80°C Yes   Yes   Yes   Yes    Yes
LED temp/status/fault diagnosis display  Yes / no Yes   Yes   Yes   Yes    Yes


SAP 2009 annual efficiency (PCDB/ SEDBUK) % 89.2 89.2 89.2 89.1  89.1
NOx class (5 being the lowest) 1 - 5 5 5 5 5  5

ErP product information 

NOx  mg/kWh  18 20  21  24  24 
 Sound power level, indoors  LWA dB  32  33  34  37  37 
Space heating efficiency class    A
Heat input CH  kW max gross (QnHs) 14.88 18.32  21.75  28.62  34.35 
 kW min gross (QnHs)  8.59 8.59  8.59  8.59  8.59 
Heat output CH (non condensing)  kW max (Pn) 13  16  19  25  30 
 kW min (Pn)  7.5 7.5  7.5  7.5  7.5 
Gas supply pipe size  (mm) 22 22  22  22  22 
Inlet supply pressure (natural gas)  mbar 20 20  20  20  20 
 Maximum gas rate  m3/hr 1.42  1.75  2.07  2.73  3.27 


Electrical supply  Volts/Hz  230V/50Hz  230V/50Hz  230V/50Hz  230V/50Hz  230V/Hz
Permanent live required  Yes / no No No No No  No
Switched live Yes / no Yes  Yes  Yes  Yes  Yes
Electrical power cable fitted as standard 1m of 3 core Yes Yes Yes Yes Yes
Power consumption Watts 17  20  23  33  44
External fuse rating  Amps  3
Internal fuse rating   1.6T 1.6T 1.6T 1.6T 1.6T
Boiler IP rating (electrical protection)  Approval category IPX4D IPX4D IPX4D IPX4D IPX4D 

Mechanical and hydraulic

Compartment ventilation required  Yes / no No No No No No
Flow / return pipe size (mm) 22 22 22 22 22
Condensate discharge pipe size (mm)  21.50  21.50 21.50  21.50 21.50

Concentric flue systems 

 Standard telescopic concentric flue  Length in mm  315-500 315-500  315-500  315-500 315-500 
Horizontal concentric (60/100mm)   Max equivalent length (m) 6 6 6 6 6
Reduction per 135° bend (m)  0.5 0.5 0.5 0.5 0.5
Reduction per 93° bend (m)  1 1 1 1 1
Horizontal concentric (80/125 mm) Max equivalent length (m)  12 12 12 12 12

Twin pipe flue system 

Horizontal twin tube (80/80 mm) Max equivalent length (both tubes in parallel) (m) 9 9 9 9
Reduction per 135° bend (m) 0.25 0.25 0.25 0.25 0.25 
Reduction per 93° bend (m)  0.5 0.5 0.5 0.5 0.5 


Installer lift weight  Max (kg)  19.5 19.5 19.5 19.5 19.5
Gross packaged boiler weight  (kg)  21.5 21.5 21.5 21.5 21.5
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Download the full technical specification for the Potterton Ultra Heat

When clicked this will open the product specification in PDF format.

The following accessories and controls are compatible with the Potterton Ultra Heat. To find out more, visit our Accessories and Controls page.

  • Twin channel wired programmer
  • Room thermostat

Potterton Ultra Heat ErP labels

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