ASHP Guide
Radiator sizing for ASHP projects: start with survey quality
Most radiator sizing problems are not maths problems. They are input quality problems.
Inputs that move the result
- Reliable room dimensions and external wall context.
- Window and door assumptions that are visible and reviewable.
- Emitter condition notes where replacements are likely.
- Clear exceptions and inaccessible areas flagged at handoff.
Typical causes of rework
- Incomplete room data hidden in long note sections.
- Assumptions not documented next to evidence photos.
- No single source of truth for updated survey files.
How to tighten the handoff
Use one structured pack format, deliver through portal, and keep assumptions explicit. That is the fastest route to fewer redesigns and cleaner install planning.