INDEPENDENT HEAT PUMP DESIGN · NO SALES, NO INSTALLATIONS, NO COMMISSIONS
WEST YORKSHIRE · ENGLAND & WALES · HELLO@HEATLOSSHUB.CO.UK
NEW BUILD & SELF-BUILD HEAT PUMP DESIGN
A new build is one of the best opportunities to design a heat pump system properly.
You are not forced to work around an existing boiler, old pipework, finished floors or a cylinder cupboard that was never designed for a heat pump.
But that advantage can disappear very quickly.
Once floors are laid, walls are closed, plant spaces are fixed and pipe routes have been chosen, changes become more expensive and compromises start to creep in.
Heat Loss Hub can help you plan the heating and hot water system from the drawings, before the build locks those decisions in.
Retrofitting a heat pump into an existing property often means working around decisions that were made years ago.
The pipework is already there.
Radiators are already positioned.
The cylinder has to fit into an existing cupboard.
The consumer unit may be on the other side of the house.
The only available heat pump position may be the one nobody else wanted.
A new build gives you a much better starting point.
You can decide:
The key is to make those decisions while they are still easy to change.
Do not design the house and then ask where the heat pump will fit. Design the services while they are still lines on the plan.
There are several decisions that are much easier to get right before plumbing, electrics and finishes are installed.
The heat pump position affects more than appearance.
It should be considered alongside:
Leaving the heat pump location until the end of the build often means choosing from whatever space is left.
That is rarely the best way to design a heating system.
The cylinder needs enough space, but space alone is not enough.
The location also affects:
In a new build, the cylinder location should be planned as part of the services strategy, not treated as an afterthought.
A new build gives you the opportunity to design the emitters around the heat pump rather than trying to make an existing system fit.
That could mean:
There is no single correct answer for every property.
The important thing is that the emitter design follows the room-by-room heat loss and the intended heating flow temperature.
The route between the heat pump and the plant area can have a big effect on the installation.
It is worth deciding early:
If the route is planned before first fix, it can be neat and direct.
If it is left until later, it often becomes a workaround.
A heat pump needs a suitable electrical supply.
Depending on the system, there may also be:
Planning the electrical route early can avoid unnecessary surface wiring or disruptive changes later.
Controls should suit the system design.
They should not simply be added once all the heating circuits already exist.
If the property will have multiple zones, underfloor heating manifolds or mixed emitters, the control strategy should be understood from the beginning.
A new house may be very well insulated, but that does not mean the heating requirement should be guessed.
Two homes of the same size can still have different heat losses because of:
A room-by-room heat loss provides the foundation for the rest of the design.
It helps determine:
That is a much better starting point than choosing a heat pump from floor area or bedroom count alone. It also gives you something solid to hold against any heat pump installation quote you receive later.
A large new-build home does not automatically need a large heat pump.
Modern construction standards can produce relatively low heating loads compared with older properties.
That means a physically large house may have a surprisingly modest space-heating requirement.
Oversizing the heat pump can create its own problems.
A unit that is much larger than the actual heating demand may spend more time operating below its ideal range, particularly during milder weather.
The correct approach is to size from the calculated design heat loss and the heat pump’s performance at the intended operating conditions.
Both can work well with a heat pump.
Underfloor heating is particularly easy to integrate into a new build because the floor construction can be designed around it from the beginning.
It can operate at low water temperatures and provide even heat across the room.
But underfloor heating is not compulsory.
Correctly sized radiators can also work very well — the same sizing principles that decide whether existing radiators can work with a heat pump in a retrofit apply here, except that in a new build you get to apply them before the radiators are bought.
A common new-build arrangement is:
underfloor heating downstairs + radiators upstairs
but that should not be treated as a universal rule.
The choice should depend on:
The important thing is to design the emitters around the actual room requirements.
In a highly insulated new build, the space-heating demand may be relatively low.
The household still needs hot water.
That means domestic hot water can become a significant part of the overall system design.
The cylinder should be selected with consideration for:
A cylinder that is too small may create unnecessary hot water shortages.
A cylinder that is unnecessarily large takes up more space and may increase standing losses.
The aim is to size it appropriately for the way the property will actually be used.
Our cylinder reheat calculator shows how cylinder size, coil performance and heat pump output translate into a realistic reheat time.
SEND THE PLANS
If you already have architectural drawings, floor plans or construction drawings, send them before the plumbing and heating layout is fixed.
Plans can allow the design process to begin while changes are still relatively inexpensive.
Useful information can include:
You do not need to have every detail finalised before making contact.
The earlier the project is reviewed, the easier it is to identify what information is still needed.
That is common during the early stages of a new build.
A preliminary design can often begin using the proposed construction details.
However, the final design assumptions should reflect what is actually going to be built.
Changes to things such as:
can affect the final heat loss.
If the specification changes during the build, the heating design may need to be reviewed.
A new build is also a good opportunity to plan other electrical technologies at the same time.
You may be considering:
These do not need to dictate the heat pump design, but it makes sense to think about:
Planning all of the major services together is usually easier than adding them one at a time after the build is complete.
New housing is moving in the same direction.
The Future Homes and Buildings Standards were laid on 24 March 2026 and come into force on 24 March 2027. Transitional arrangements apply where a building notice, initial notice or full plans application is given before that date and the work starts before 24 March 2028.
The notional dwelling used to set the performance targets is heated by a heat pump, and there is a new requirement for on-site renewable electricity generation.
The standard sets performance targets rather than mandating a particular technology, so it does not decide the system for you. It does mean that a heat pump and solar PV together are becoming the normal starting point for a new home rather than the exception.
New-build properties are generally not eligible for the Boiler Upgrade Scheme.
There is an exception for certain self-build properties that meet specific criteria.
Where a self-build does qualify, a heat pump can be eligible provided all the other scheme rules are met. Biomass boilers are not eligible in self-build properties.
Do not assume the grant applies simply because a heat pump is being installed.
Eligibility should be checked against the current scheme rules before relying on grant funding within the project budget.
Start with the property, construction stage and what you are planning. You do not need to know the heat pump size.
If plans are available, they can be reviewed as part of the next stage.
The project is assessed to establish what is known, what is missing and what the most appropriate next step should be.
Where the project progresses to design, the heating system can be developed around the finished property rather than being forced to work around decisions that have already been built.
The heat pump should follow the design requirement, not the other way around.
A heat pump system can require very different flow rates from a conventional boiler system. Pipework should be checked against the actual design flow requirements.
Underfloor heating can work extremely well with a heat pump, but it still needs to be designed correctly. Pipe spacing, floor build-up, flow temperature, flow rates and room heat loss all matter.
A cupboard may look large enough on a drawing but still be unsuitable once access, pipework and servicing requirements are considered.
A direct, well-planned route is far easier to install than trying to find a path through a finished building.
Cable routes and electrical capacity should be considered while the services are being planned.
The unit needs to work technically as well as visually. Noise, drainage, airflow, servicing and pipe routes all matter.
If the fabric changes, the heat loss may change too. The final heating design should match the final building specification.
A self-build project can involve several different people making decisions about one heating system.
You may have:
Each may be responsible for only one part of the job.
The risk is that nobody is looking at the heating system as a whole.
Independent design can provide a common technical starting point so that everyone is working from the same assumptions.
That can help reduce conflicting decisions and expensive changes later.
FROM THE DRAWING BOARD
In real projects, some of the most expensive compromises happen because the heating design starts too late.
The pipe routes have already been boxed in.
The cylinder cupboard is too small.
The underfloor heating has already been ordered.
The electrical route has already been plastered over.
Or the only remaining heat pump position creates problems.
The aim is to make those decisions while they are still easy to change.
A new build gives you that opportunity. Use it.
Yes. Modern, well-insulated homes can be very well suited to heat pumps, provided the system is correctly designed around the actual heat loss and required operating temperatures.
No.
Underfloor heating can work very well with heat pumps, particularly when it is designed into the floor construction from the beginning, but correctly sized radiators can also be used.
Ideally before first fix and before key decisions such as the cylinder location, heat pump position, pipe routes and electrical routes become difficult to change.
The heat pump should be selected from the calculated design heat loss and the unit’s performance at the intended operating conditions.
Floor area and bedroom count can help with early assessment but should not be used as the final sizing method.
Architectural plans can provide a strong starting point, particularly when they are supported by proposed construction and insulation details.
Final design assumptions should reflect what will actually be built.
That can be a very effective arrangement, but it is not automatically the best solution for every house.
The emitter design should follow the room heat loss, floor construction, available space and intended operating temperatures.
The locations should be considered alongside access, noise, drainage, pipe routes, electrical requirements, hot water distribution and future servicing.
Yes.
In fact, that is often the best time to start because changes are much easier to make while they are still on the drawings.
START YOUR NEW BUILD PROJECT
You do not need to know which heat pump to buy.
You do not need to have finished every construction detail.
And you do not need to wait until the plumber is ready to start.
If you have plans and are considering a heat pump, start the conversation early.
Tell us about the project, upload the information you already have and we can work out the most appropriate next step.
