Free, SANS-based sizing tools built by SIRAC engineers. Get an indicative system selection on screen, then send your spec straight to our team for a fully engineered design.
Size a SIRAC heat pump system to SANS hot water allowances, then match it to Thermocube or Thermotube storage. Includes COP de-rating for cold climates and a printable spec sheet.
Open CalculatorSize the stainless-steel heat-exchanger coils for a Thermocube or Thermotube vessel from your flow rate and water temperatures. Reads the heat exchange coefficient and pressure drop off the SIRAC tubing curve at your actual flow.
Open CalculatorSee how a SIRAC heat pump system contributes to a building’s energy-efficiency compliance under SANS 10400-XA, with an indicative note for your plans submission.
Results from these tools are indicative and intended for early-stage planning. Final system design, model selection and performance should always be confirmed by the SIRAC engineering team.
These are the same calculations SIRAC engineers use when scoping a project, published so consulting engineers, contractors and developers can get to an indicative answer without waiting on a call. Both tools are free, need no login, and produce a printable technical specification you can attach to a tender or a budget submission.
Works out how much hot water storage a building needs from the SANS 10252 storage allowance for its occupancy type, converts that into a heating load over your chosen recovery period, adds line losses, and matches the result to a SIRAC heat pump selection. It will also size the storage vessel and its heat-exchanger coil kit. Open the heat pump sizing calculator.
Works out the coil length, coil count and pressure drop for the heat exchanger inside a hot water storage vessel, from your flow rate and water temperatures. Heat exchange coefficient and pressure drop are read off the SIRAC tubing curve at your actual per-coil flow rather than assumed. Open the coil sizing calculator.
They give a defensible indicative selection for early-stage planning, budgeting and tender scoping. They are not a substitute for an engineered design: final model selection, redundancy, pipework, controls and commissioning are confirmed by the SIRAC engineering team against the specific project. Every result can be sent straight to that team for review at no cost.
Typical applications include hotels, hospitals and clinics, high-rise residential, student accommodation, social housing and commercial buildings.