Design tools
Design in Payaca, or in the tool you already use
Solar design with Glow and heat pump estimates with Flow. EasyPV, Heatpunk, OpenSolar and Spruce still connect.
“Key things for us were integration with AI, renewables, alignment with our vision.”
Glow draws the wiring too
Glow strings the panels to your inverters, checks them against the inverter's limits and draws the single-line diagram.

Flow gives the customer a number before the survey
From the enquiry form, Flow drafts an indicative estimate with the heat loss on it.

Frequently asked questions
- Can I design solar inside Payaca?
- Yes. Glow is native solar design in Payaca. You pin the roof, Glow pulls high-resolution imagery, finds the roof faces and lays the panels out from your own catalogue, and the design becomes an MCS compliant estimate on the project. Glow is in limited release for UK installers.
- Can I estimate a heat pump without a design tool?
- Flow produces an indicative heat pump estimate from your enquiry form. Payaca pulls the EPC, runs the heat loss and sizes the pump and cylinder from your own appliance list, so a number goes to the customer before a survey is booked. It is the fast estimate, not room by room heat loss, so your design tool still does that part.
- Do the design tool integrations still work?
- Yes. EasyPV, Heatpunk, OpenSolar and Spruce are unchanged. Glow and Flow are an additional native option, not a replacement, and plenty of installers will run both.
- Which UK design tools does Payaca integrate with?
- Payaca integrates with EasyPV (solar PV design with Magic Mode and 3D modelling), Heatpunk (MCS-compliant heat loss calculations), OpenSolar (solar design with shade analysis), and Spruce (heat pump system design).
- How does the EasyPV integration work?
- Design solar systems in EasyPV using Magic Mode, 3D modelling, or Quick Roof. When your design is complete, system specifications, equipment lists, and pricing sync directly into a Payaca proposal.
- Does the Heatpunk integration support MCS compliance?
- Yes. Heatpunk produces MCS-compliant heat loss calculations, and these flow directly into Payaca proposals. System sizing, equipment specifications, and documentation requirements are all captured.
- Can I use multiple design tools with Payaca?
- Yes. Many installers use EasyPV or OpenSolar for solar designs and Heatpunk or Spruce for heat pump designs. Payaca connects to all of them, so whichever tool you use, the data flows into your quotes.
- Can I store CAD files and large survey packs in Payaca?
- Yes. Design files, CAD single-line diagrams and elevations (DWG, DXF, IFC), heat loss calculations, and full survey packs up to 250MB are stored with the project. Your team can access everything from one place, on any device, so the job record is the full picture rather than a link to a file in someone's inbox.
Dedicated onboarding available
Ready to run more installs without losing control?
Growing installers run their whole job on Payaca, from design or enquiry to payment. We'll handle your workflow mapping and data migration.
- Dedicated onboarding
- Data migration support
- AI + human support