Potterton Sirius Three 70kW Floor Standing Commercial Boiler

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Compact floor-standing, stainless steel condensing boilers suitable for a variety of applications including replacement projects, large domestic, and commercial premises requiring outputs from 50kW to 1MW.

● Outputs of 50kW, 70 kW, 90 kW, 110kW, 130kW, 150kW, 200kW and 250kW, making it suitable for a wide range of commercial applications
● Wide 9:1 modulation ratio reducing constant on/off cycling to improve efficiency and boiler longevity
● A gross seasonal efficiency of up to 97.5% reduces energy consumption
● 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
● Programmable to work with solar thermal, biomass and buffer tanks, for a sustainable, energy efficient solution across the complete range
● Suitable for LPG conversion; LPG conversion kits are available for off-grid applications
● Lightweight stainless steel heat exchanger for reliable and energy efficient heat transfer
● Integrated Low Loss Headers and Plate Heat Exchangers (available as options) are easier to install and offer a professional finish and reduced footprint
● A very compact design, with casters on the bottom of larger output boilers. Boilers will pass through 700mm doors and are easier to position when space is at a premium
● 1 flow and return connections (50-70kW) avoids major pipework modification
● An integrated Cascade function allows up to 16 boilers to be managed by the Siemens controller
● 0-10 volt connection provides a quick and simple interface with BMS
● Weather compensation functionality reduces operation costs
A low Nox of under 24.6mg/kW minimises impact on the environment
● ErP compliant, reducing carbon emissions and improving efficiencies in support of government targets
● Certified for the ETL*, part of the Enhanced Capital Allowance (ECA) tax scheme for businesses
● Five year parts and labour warranty** for complete peace of mind"
More Information
Manufacturer Part Code7612361
Product TypeCommercial Boiler
Fuel TypeNatural Gas or LPG
Product OptionsFloor Standing
Heat Output70 kW
Warranty5 years
Depth681 mm
Height848 mm
Width600 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.