Features

Comprehensive calculations, simple to use

A robust SAP 10.2 & EN12831 engine and an AI assistant do the heavy lifting — you review and decide.

Live Room-by-Room Heat Loss

Build a room-by-room heat-loss model using property geometry, fabric performance and local design temperatures. Every edit recalculates the room load immediately, keeping the whole-home result traceable.

What it delivers

  • SAP 10.2 and EN 12831 methods
  • Live fabric and ventilation losses
  • Room-level calculation evidence

Building Heat Loss

SAP 10.2 · live calc

5.80kW

total

Living Room1.63 kW
Kitchen1.15 kW
Master Bedroom1.46 kW
Bathroom0.74 kW

Fabric + ventilation losses per room, recalculated live.

EPC & Document AI Parsing

Bring EPCs, plans and supporting documents into one reviewable evidence trail. HeatLens extracts likely values, shows where they came from and leaves the assessor in control of every accepted update.

What it delivers

  • Source-linked field proposals
  • Confidence and page references
  • Accept or reject before applying

EPC Certificate.pdf

8 pages
Floor area112 m²
Wall type · extractedCavity
Build year1932
Wall U-value1.55 W/m²K
5 values accepted · evidence linked

Emitter Suitability at Low Flow

Check every existing radiator at the proposed low flow temperature. Outputs are adjusted against each room’s design load so undersized emitters are visible before specification or installation.

What it delivers

  • Live output at target flow temperature
  • Pass, marginal and undersized flags
  • Room-by-room replacement evidence

Emitter Suitability

@ 45°C flow temperature

Living Room

K2 · 600×1000

112%

Pass

Kitchen

P1 · 600×800

84%

Marginal

Spare Room

P+ · 600×500

61%

Undersized

Auto-Generated Retrofit Scenarios

Compare practical retrofit pathways against the current property. Fabric upgrades, airtightness and heat-pump assumptions flow through to heat loss, system size, energy use and estimated running cost.

What it delivers

  • Editable retrofit assumptions
  • Capex and running-cost comparison
  • Whole-home impact shown side by side

Retrofit Comparison

3 scenarios

Baseline

5.8kW

£942/yr

Fabric Upgrade

3.9kW

£631/yr

Full Retrofit

3.1kW

£502/yr

Best option savings £440/yr

Heat Pump & Tariff Modelling

Model heat-pump running costs against flat, time-of-use and agile-style electricity tariffs. Monthly demand and weather-compensated SCOP reveal when energy is used—not just the annual total.

What it delivers

  • Monthly weather-adjusted performance
  • Day and off-peak consumption splits
  • Tariff source and review tracking

Annual Running Cost

Flat£1048/yr
Time of Use£884/yr
Agile£912/yr
Time of Use saves £164/yr

Results & Professional Reports

Turn the completed assessment into a clear technical result and professional project evidence. Key assumptions, room loads, system sizing and cost outcomes remain connected to the underlying calculation.

What it delivers

  • MCS-ready calculation summaries
  • Client and installer report views
  • Versioned, reviewable project evidence

Heat Loss Report

MCS Ready
Building summary
Room-by-room loads
Heat pump sizing
Emitter schedule
Tariff & running cost

5.80

kW heat loss

6.0

kW HP size

3.2

SCOP

Project Advice by Chat or Phone

Chat with the HeatLens AI assistant about your specific project. It reads your rooms, emitters, scenarios, tariffs and uploaded evidence, so its advice fits your property, from radiator sizing to tariffs to the best measures for your install. Prefer to talk it through? Book a free phone callback from our virtual agent, which has detailed information on UK heat pumps, grants, loans, and design and installation.

What it delivers

  • Answers based on your own project data
  • Free phone callback from a virtual agent
  • Advice supports your design, not a certified design

HeatLens Assistant

Will the kitchen radiator keep up at 45°C flow?
At 45°C it gives about 948 W against a 1,125 W room load, so it is marginal. A larger radiator would cover the 177 W shortfall.
Prefer to talk it through? Free callback