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RHH Calculators and Tools: Development, Feedback and Discussion

Air Source Heat Pumps (ASHPs)

Last Post by Mars 57 minutes ago

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Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4586

Topic starter 11/05/2026 10:23 am [#2990]

We're building a series of interactive tools and calculators for the site starting with a heat pump installation sense checker that's just gone into beta. Link below.

The idea is to give homeowners enough grounding to ask the right questions of their installer (on sizing, controls and commissioning) without turning them into engineers.

This thread is the place to discuss all of it. If you've used a tool and something doesn't look right, flag it here. If you think a threshold is too aggressive or too lenient, make the case. If you have ideas for tools we should build next, bring them.

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calculators tools

Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4586

Topic starter 11/05/2026 10:26 am

We've published a flow rate and pipe sizing calculator on the site. Your heat pump is rated at a specific output, but it can only hit that output if the primary pipework can actually move enough water to carry the heat. Get the primary pipe run wrong and the system is throttled before it's even switched on.

The calculator tells you the flow rate your system needs, checks whether your pipe diameter can deliver it, and shows you velocity and pressure drop across the run. Common copper and PEX sizes are preloaded.

https://renewableheatinghub.co.uk/is-poor-flow-throttling-your-heat-pump/

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Mars

(@editor)

Illustrious Member Admin

Joined: 5 years ago

Posts: 4586

Topic starter 11/05/2026 10:31 am

This tool currently runs two independent checks on a heat loss estimate (W/m² against property age and fabric, and a cross-reference against historical gas consumption) then asks four installer qualification questions covering controls, buffers and commissioning. The idea is to give homeowners enough grounding to push back on a quote before they sign anything.

It's in beta. The sizing logic is solid but the building categories and W/m² thresholds are still being refined. If you run it against a real installation (yours, a recent one you've been involved with or a horror story from the forum) and something doesn't look right, please say so here.

https://renewableheatinghub.co.uk/does-your-installers-heat-loss-figure-actually-stack-up

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Subscribe and follow our YouTube channel!

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