Hysopt - Hydronic System Optimisation Logo


Unlock the potential of your Low Carbon Heat project

The Public Sector plays a key role in reaching our 2050 Net Zero Targets. Discover how Hysopt helps public sector organisations to transition towards low carbon heat across their buildings and estates.

By optimising efficiency, reducing costs and bringing transparency about the performance of planned low carbon heat solutions, organisations are able to lower risks and maximise the benefit from funding schemes such as:

  • Public Sector Decarbonisation Scheme
  • Scottish Public Sector Green Heat Decarbonisation Fund
  • Green Heat Networks Fundy

Free Calculation Request your free low carbon scheme calculation

Technical Annex Salix 3b

Technical annex to Salix Phase 3b Guidance notes


Making Public Buildings Low Carbon Ready. Webinar with New Castle City Council.


5 Ingredients for a succesful heat pump deployment in your public buildings

Case Study

Discover our case study with Newcastle City Council

How Hysopt can help with your low carbon heat project:

1. Free Low carbon heat assessment

Take advantage of Hysopt’s unparalleled expertise in optimising heating systems by using our FREE low carbon heat optimisation calculation to support your application bid.

Our calculation will help you understand the potential carbon, energy cost and capital cost impacts a properly optimised low carbon heat solution can make; and provide you with all the key metrics required for your PSDS-3b application or other low carbon heat schemes.

2. Hysopt conceptual study

For a more indepth study, our conceptual optimisation study will create a full digital model of your current installation, complete with dynamic simulations of how low carbon heat options will perform.

Our power Pareto Analysis Tool will provide an objective comparison of different design options against a range of KPI’s and performance metrics, providing detailed evidence to support your PSDS bid or underpin your heat decarbonisation plan.

Technical Annex to Salix Phase 3b Guidance Notes

This technical note has been prepared by Hysopt as a supplement to the Salix Phase 3b Public Sector Decarbonisation Scheme Guidance (August 2022).

Previous Succes Stories

Public sector clients already benefiting from the use of Hysopt hydraulic digital twin modelling in their low carbon heat project.

Less risk, lower cost and more certainty with Hysopt!

One of the greatest 2050 Net Zero targets is decarbonising the way buildings are heated. Most public buildings still rely on fossil fuel-based heating. Since these approaches are end of life, it is an ideal opportunity to transition to a low carbon approach.

Low carbon heating and cooling measures, such as heat pumps and low carbon heat networks, have the potential to deliver immediate carbon savings, but they are not a like-for-like replacement for gas boilers. Experience from previous funding rounds has already shown the opportunity for good practice system design is being missed. 

Public sector clients tell us that decarbonising heat is complex, costly and risky due to uncertainty about how systems will perform once they’re installed.

Too often the chance for best-practice system design is being missed, while the opportunity to optimise existing systems – especially in older buildings – to make them “low carbon heat ready” is not well understood.

Hysopt's CIBSE Award Winning HVAC Ditigal Twin software optimises new system designs to:

Make the right choices in the engineering phase

Deliver the design intent into the as build installation

Deliver on carbon saving objectives

“First time right” installation performances

Why use Hysopt in your low carbon heat project?

  • Lowest possible running costs;
  • Optimised capital investment costs;
  • Highest possible carbon savings;
  • Science based performance metrics and £/tCO2 savings at the bid/design stage;
  • Significantly enhanced chance of bid success;


Newcastle City Council

Scheme:  Academy secondary school – Gas boiler to heat pump upgrade 

Prior to Hysopt modelling:  proposal to install 1MW high temperature heat pumps, capex circa £1.5m 

What did Hysopt modelling prove?

  • Installation of high temperature heat pumps at high flow temps would double energy costs vs existing gas system, due to very poor seasonal efficiency (SCOP <2); 
  • Optimisation of the existing heat distribution system and taking advantage of oversizing in current installation allowed operation at lower flow temperatures, allowing “standard” temperature heat pumps to be installed; 
  • Optimisation of the control strategy could reduce peak demands further still; 
  • Results in lower upfront capex costs (£800k saving) and running costs on a par with existing gas boilers, due to much higher heat pump seasonal efficiency 
  • Cost per tonne CO2 reduced from >£750/tCO2 to <£250/tCO2 


5 ingredients for successful deployment of heat pumps into non-domestic buildings

Want to learn more about how you can sucessfully deploy heat pumps in non-domestic buildings in relation to the Public Sector Decarbonisation Scheme?

Request your FREE low carbon heat calculation

Fill in your details below and you will get access to the calculation form.

We respect your privacy. Your data is saved so that we can track your request. You can find more information about what we do with your data in our privacy declaration.

Download Technical Annex

Fill in your details below and you will get access to the technical annex.

We respect your privacy. Your data is saved so that we can track your request. You can find more information about what we do with your data in our privacy declaration.