Potterton Sirius Three 70kW Wall Hung Commercial Boiler

In stock
Product Code
You may also need
  • Andrews 5136146 Horizontal Wall Terminal Kit
Compact and lightweight, Sirius three WH condensing boilers offer a market-leading modulation ratio of up to 9:1 and come with weather compensation as standard, ensuring high seasonal efficiency all year around.

● Outputs of 50kW, 60kW, 70kW, 90kW, 110kW, 130kW and 150kW making it suitable for a wide range of commercial applications
● Lightweight stainless steel heat exchanger for reliable and energy efficient heat transfer
● Wide 9:1 modulation ratio reducing constant on/off cycling to improve efficiency and boiler longevity
● A gross seasonal efficiency of up to 97.3% reduces energy consumption
● A low NOx from 17mg/kW minimises impact on the environment
● Supplied with the latest Siemens controls with state of the art PCB, offering improved control options
● The QA75 Twist Knob Controller has a simple descriptive display and easy to use advanced programming functions
● 0-10 volt connection provides a quick and simple interface with BMS
● An integrated Cascade function allows up to 16 boilers to be managed by the Siemens controller
● Its very compact design offers both 130kW and 150kW outputs within the same footprint as 110kW
● 1 flow and return connections (50-70kW) avoids major pipework modification
● Programmable to work with solar thermal, biomass and buffer tanks, for a sustainable, energy efficient solution across the complete range
● Commissioning by Potterton Commercial engineers and service plans are available to ensure your boiler is working reliably and efficiently
● Five year parts and labour warranty* for complete peace of mind"
More Information
Manufacturer Part Code7705087
Product TypeCommercial Boiler
Fuel TypeNatural Gas or LPG
Product OptionsWall Hung
Heat Output70 kW
Warranty5 years
Depth505 mm
Height763 mm
Width450 mm


  • You can select the branch where you would like to collect your order.
  • We will send you an email when your order is ready to be collected.
  • Orders received by 3pm can be collected in the branch during opening hours on the next working day if all stock is available in the local branch
  • If we need to transfer some of your products from our central warehouse to your local branch, it may take 2-3 days for your order to be ready for collection
  • You must report any damages, shortages or incorrect items to the showroom where you collected your order within 48 hours of collection.


  • There is a delivery charge of €35 for any order under €500
  • You will be contacted by the branch to confirm you delivery details. We will also send you an email to confirm when your order has gone out for delivery.
  • Orders received by 3pm can be sent out for delivery during opening hours on the next working day if all stock is available in the local branch and a delivery slot is available. If our normal delivery service schedule is full, you will be contacted by the branch to agree alternative delivery details.
  • You must report any damages, shortages or incorrect items to Customer Support within 48 hours of delivery.

Please note you can cancel your order at any time until receipt – see our Returns & Cancellations policy for further information.