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PARTLY

As of 13 August 2026, AI can only partly estimate your boiler replacement savings.

This still needs a person who signs their name to it.

Can you do it?

5 minutesto a draft.

30 minutesto something you’d act on.

Cost, all in£0

Skill neededchat-fluent

Who has to check ityou

What the alternative costsThe supplied commercial candidates include no boiler installer or savings calculator, so no supported alternative price is available.

If this goes wrong, you may approve an expensive replacement on the basis of optimistic savings that do not appear on your future energy bills.

What to actually do

  1. Hand it to a person

    The route this page recommends

    A person who owns the outcome does this end to end, worth it when the failure is dear.

  2. Use a tool built for this

    Second choice

  3. Do it yourself

    The distant third

    A chat interface, chat-fluent skill, and roughly 30 minutes until you can act on the result.

    How to actually do it

    1. Open your recent gas and electricity bills and copy the actual usage, billing period, unit rates and standing charges into a note.
    2. Find the boiler's make, model, age, fuel type and service information, and photograph or transcribe the data plate if it is accessible without removing anything.
    3. Obtain a written replacement quote showing the proposed boiler, controls, installation work and total price, then paste those details into the prompt.
    4. Paste the collected information into the chatbot prompt and ask it to calculate a cautious range for annual savings and payback, with every assumption labelled.
    5. Compare the chatbot's usage and tariff figures with your bills and delete any calculation that uses an invented or unexplained figure.
    6. Ask a qualified heating engineer to confirm the proposed boiler size, likely efficiency, controls and installation assumptions before relying on the estimate.
    7. Recalculate the payback using the confirmed quote and assumptions, then compare that result with the cost and condition of keeping your current boiler.

    Prompt

    Estimate the potential annual and payback savings from replacing my boiler, using only the information I provide and clearly labelled assumptions. Do not invent missing figures. Separate known facts, estimates and unknowns. Use my recent energy use, current tariff, boiler type, boiler age, service history, replacement quote, proposed replacement type, heating controls and expected changes in usage. Show the calculation step by step, give a cautious range rather than false precision, and explain which assumptions have the greatest effect. Compare keeping the existing boiler with replacing it. Do not claim that a replacement will definitely save money, do not recommend a specific installer, and do not present this as professional heating or energy advice. Tell me which figures I should confirm with my energy supplier or a qualified heating engineer before making a decision. Here is my information:

[Paste your bills, meter readings, boiler details, replacement quote and tariff information here.]

    Open it prefilled in ChatGPT or Claude, or copy it into Gemini, which takes no prefill link.

What it gets wrong

  • AI cannot inspect your boiler, radiators, controls, insulation or heating system condition.
  • AI cannot establish the boiler's real-world efficiency from age and model details alone.
  • AI cannot predict your future energy use, tariff changes or how your heating habits will change.
  • AI cannot tell whether a replacement boiler is correctly sized or whether the installation quote includes all necessary work.
  • AI cannot take responsibility for the replacement decision or guarantee that the estimated saving will appear on your bills.

What caps this at PARTLY: verification cost, judgement under ambiguity and stakes of error.

How we scored this

Five axes, each scored nought to two by hand: ten means AI carries the task cleanly, and the thresholds that turn a total into YES, PARTLY or NO are published in the methodology. Each axis name links to its definition.

AxisScore (0–2)
Output2
Inputs1
Verification1
Liability1
Effort delta2
Total7 / 10

The methodology and its thresholds are published in full.

FAQ

Can AI calculate how much I would save with a new boiler?
Yes, it can produce an estimate from your actual energy use, tariff, boiler details and replacement quote. Treat the result as a range because boiler efficiency, future usage and installation quality may be uncertain.
What information does AI need to estimate boiler savings?
Give it recent gas usage, tariff details, boiler make and age, service history, the replacement quote and the proposed controls. Include the billing periods and ask it to identify missing information instead of filling gaps with guesses.
Can AI tell me whether replacing my boiler is worth it?
It can compare an estimated saving with the replacement cost and show a possible payback period. It cannot inspect your heating system or confirm that the installation will deliver the assumed efficiency, so ask a qualified heating engineer to check those points.
Is an AI boiler saving estimate reliable?
It is useful for organising the arithmetic and exposing assumptions, but it is not a guarantee of future savings. Check every input against your bills and have a qualified heating engineer confirm the system and installation assumptions.

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Assessed by gpt-5.6-luna (gpt-5.6-luna) on 2026-08-13, second-checked by an independent model. Wrong somewhere? Email [email protected] and it gets re-checked.

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