Table of Contents
- What’s this episode actually about?
- Why heat pump installs used to cost so much
- The shift: design around efficiency, not “flow temp chat”
- What ZeroDisrupt does (and what it doesn’t)
- The result: less work in the home
- Upfront cost: cheaper than boilers (yes, upfront)
- Why this helps installers (not replaces them)
- Common myths addressed in the episode
- Next step: see what this looks like for your house
Can a heat pump really be cheaper than boilers? On the Everything Electric podcast, Heat Geek’s founder Adam Chapman joined Robert Llewellyn to explain how we’ve done exactly that.
We’ve created a way to install high-efficiency heat pumps, with minimal disruption, for less than the cost of a gas boiler replacement. And it’s not theory – it’s live, nationwide, and working.
What’s this episode actually about?
This wasn’t a “heat pumps are good” chat. The point of the episode was simple:
- Heat pumps can now be installed with less disruption
- For an upfront cost that’s cheaper than boilers in many cases
- While still targeting high efficiency (and guaranteeing it)
The big unlock is how we design systems—using measured performance data from thousands of installs, not conservative assumptions.
Why heat pump installs used to cost so much
Traditional heat pump design is often cautious for understandable reasons. To avoid callbacks, designers tend to build in contingency:
- Assume worst-case hot water demand
- Assume open windows on a cold day
- Oversize emitters “just in case”
- Swap cylinders even when the existing one could work
- Repipe systems because “heat pumps need it”
That approach can deliver good results, but it’s slow, disruptive, and expensive. It also doesn’t scale if the goal is to decarbonise homes at national level.
The shift: design around efficiency, not “flow temp chat”
One of the key points Adam made is that homeowners don’t really care about flow temperatures. They care about:
- Will the house be warm?
- What will it cost to run?
- How much disruption will there be?
- How confident can I be it’ll work?
So we’ve pushed the conversation away from “we’ll design for X °C flow” and toward:
- This is the efficiency you’re buying
- This is the minimum you need to change to hit it
That’s a very different sales and design model—and it’s easier for both homeowners and installers to work with.
What ZeroDisrupt does (and what it doesn’t)
Adam described our new system as Zero Disrupt – an AI-assisted design approach that chooses the minimum changes needed to hit a selected efficiency.
It’s built on two things:
1) A scan + structured data capture
Our engineers scan the property (creating a 3D model) and collect details that actually affect outcomes, such as:
- Existing radiator sizes / room-by-room situation
- Hot water cylinder details (coil size, etc.)
- Water hardness
- Shower flow rates and hot water demand indicators
- Occupancy details (because demand matters)
The more accurate the input data, the less “risk margin” we need to add.
2) Real-world performance data
We’ve been monitoring installs in the wild and comparing:
- What we designed
- What we installed
- How it actually performed over time
That’s the bit that changes everything. It turns out many installs were over-specced. Not because engineers were incompetent – because the industry has historically designed with a lot of “fat” to stay safe.
The result: less work in the home
The practical outcomes Adam talked through are the stuff homeowners and installers both care about:
- Fewer radiator swaps (often none; on average around one)
- Reusing existing cylinders more often
- Avoiding repipes in most cases
- Less time on site
- Less disruption in lived-in homes
And because the system is selecting only what’s necessary to hit the chosen efficiency, you’re not paying for upgrades you don’t need.
That’s how we get to installs that are cheaper than boilers—not by magic hardware, but by removing wasted scope.
Upfront cost: cheaper than boilers (yes, upfront)
In the episode, Adam explained that the base install cost (before “extras”) is now around £3k in many cases, which puts it in the same ballpark as a boiler swap—often cheaper than boilers.
And then there’s the Boiler Upgrade Scheme (BUS):
- If you’re eligible and use an MCS installer, the BUS grant can cover a significant chunk of the install cost.
- In some cases, that means the homeowner’s contribution can drop very low (even near-zero), depending on choices and site specifics.
(We don’t promise savings based on tariffs because we can’t control tariffs—but we do guarantee efficiency.)
Why this helps installers (not replaces them)
A big theme in the conversation was: this is not “AI replaces heating engineers.”
It’s “AI removes the bits that waste engineers’ time.”
Instead of spending days designing, ordering, re-ordering, and overthinking risk, engineers can:
- collect good-quality survey data quickly
- generate a robust spec faster
- spend time installing well
- do more installs per month without lowering standards
That’s good for customers, and it’s good for small independent businesses—because it makes heat pumps easier to deliver at scale.
Common myths addressed in the episode
“Heat pumps don’t work in older homes”
Adam’s position was clear: with proper design and competence, heat pumps work in all housing ages (Victorian included). Older homes can be more challenging if you don’t know what you’re doing – but they’re not “impossible homes”.
“They’re loud”
Modern units are significantly quieter than people expect. You may hear more noise at very low outdoor temps when the unit is working hardest, but the average user experience across the year is typically far quieter than many assume.
“You need to fully insulate first”
Insulation is still a good idea, but the claim that you must fully insulate for a heat pump to be worthwhile is often overstated. Competent design is the bigger variable.
Next step: see what this looks like for your house
If your boiler is on the blink, or you’re just trying to get a realistic figure:
Check your postcode for a heat pump estimate: https://heatgeek.com
