Hestora FHS portal

Future Homes Standard modelling

Model a property against the Future Homes Standard using the government's own Home Energy Model engine, and see how Hestora high-temperature thermal storage performs against a gas boiler and an air-source heat pump. The knowledge base explains how FHS compliance is assessed and where a thermal store fits.

Registering takes a moment and gets you straight in — no approval, and no password to set up. We send a sign-in link to your email address.

Modelling tool

Your specification against the FHS notional dwelling on the government's HEM engine, with running-cost comparison against a gas boiler and an air-source heat pump.

Knowledge base

How compliance is actually assessed, why solar PV is accounted for the way it is, and where a thermal store fits.

What this is. A design-exploration tool for the Future Homes Standard, not a statutory assessment. It runs the government's own Home Energy Model engine so you can see how a specification behaves against the FHS notional dwelling — compliance itself can only be demonstrated through an approved assessment route by a qualified assessor.

The Home Energy Model has not been released. The tool runs the current pre-release engine (1.0.0-alpha-7, build 2026-08-21) and FHS wrapper (1.0.0a7), which are still in development. Results will move between releases; we rebuild against each one as it is published, and every page stamps the versions behind its numbers.