Propane Heat Pumps Checklist

Propane Heat Pumps: 21 Things Smart Buyers Check Before Spending a Penny

Buying commercial heating equipment becomes expensive long before anybody switches it on.

There's the machine itself, installation, electrical work, pipework, controls, commissioning and possibly alterations to the building. After that comes the cost that keeps ticking for years: electricity.

This is why I'd never choose a heat pump simply because its brochure displays an impressive COP or the quotation arrives cheaper than everything else.

The machine needs to fit the application.

Get that relationship right and you could have an efficient heating and cooling system working quietly in the background for years.

Get it wrong and you're effectively buying an expensive problem with fans attached.

Here are the things worth investigating before signing an order.

1. Start With the Building, Not a Brochure

Forget manufacturers for the moment.

What does the building actually need?

Calculate its peak heating load using realistic design conditions.

That assessment should account for insulation, glazing, ventilation, air leakage, internal gains, ceiling heights, construction and local climate.

Commercial properties can vary enormously.

Industrial facilities introduce process heating, ventilation loads and production schedules that make rough calculations even less useful.

Don't size equipment according to square metres alone.

Calculate the job before selecting the tool.

2. Separate Peak Demand From Annual Consumption

These are related figures, but they tell you different things.

Peak demand helps determine required capacity during difficult conditions.

Annual consumption helps estimate running costs.

You need both.

A building might require 300 kW during an exceptionally cold morning while spending most of the year operating far below that level.

That makes part-load behaviour extremely important.

If you only examine peak capacity, you're judging equipment by a tiny fraction of its working life.

3. Avoid the Bigger-Is-Better Trap

Oversizing feels safe.

It isn't necessarily clever.

Buying significantly more capacity than required increases capital cost and can leave equipment cycling excessively when demand falls.

Commercial heating loads move constantly.

Morning warm-up differs from afternoon operation.

October doesn't resemble January.

Occupancy changes.

Industrial production fluctuates.

A properly selected machine should comfortably satisfy design demand while remaining capable of adapting when the building wants considerably less.

Buy what calculations justify.

4. Establish Your Real Water Temperature

This is one of the first figures I'd want from the system designer.

What leaving-water temperature does the installation genuinely require?

Modern underfloor heating can work at comparatively low temperatures.

Fan coils may also perform effectively without extremely hot water.

Older radiator networks can demand more.

Industrial processes may sit somewhere else entirely.

The required temperature influences efficiency significantly.

Don't ask only whether equipment can achieve 60°C, 70°C or another headline figure.

Ask what happens to electrical consumption while it is producing that temperature.

That's the useful question.

5. See Whether You Can Lower That Temperature

Existing infrastructure isn't sacred.

If old radiators require high-temperature water, investigate whether larger emitters could reduce the requirement.

Could insulation improvements shrink the load?

Would better glazing help?

Could ventilation losses be trimmed?

Could controls operate the building more intelligently?

Every unnecessary degree potentially makes the heat pump work harder.

Sometimes improving the surrounding system produces a better return than simply purchasing larger equipment.

Think beyond the plant room.

6. Understand R290

R290 is refrigerant-grade propane.

It is a natural refrigerant with an extremely low global warming potential compared with many synthetic refrigerants historically used throughout refrigeration and HVAC.

That's one reason it has attracted considerable attention as refrigerant regulations evolve.

It also offers useful thermodynamic characteristics.

But don't mistake refrigerant choice for complete system quality.

Compressors, heat exchangers, expansion devices, fans, pumps and control algorithms all influence performance.

Two machines using identical refrigerant can behave very differently.

Judge the engineering.

7. Take Flammability Seriously

Propane is flammable.

That's a known characteristic that needs to be handled through appropriate equipment design, installation and servicing practices.

Ask suppliers how their machines address R290 safety.

Find out which relevant standards are followed.

Check what requirements apply to the proposed installation location.

Refrigerant charge, equipment design, ventilation, siting and servicing procedures can all enter the assessment depending on the project.

Qualified professionals should evaluate the installation against the regulations and standards applicable in your jurisdiction.

Don't improvise around refrigerant safety.

8. Stop Chasing the Highest COP

COP is useful when understood properly.

Coefficient of Performance compares useful heating output against electrical input at a specified operating point.

A COP of 4 means four units of heat are being delivered for every equivalent unit of electricity consumed under those stated conditions.

Change those conditions and you can change the number.

Source temperature matters.

Water temperature matters.

Load matters.

Outdoor conditions matter.

So when Manufacturer A advertises 5.0 and Manufacturer B shows 4.5, you haven't necessarily learned which machine is more efficient.

First establish whether those numbers were produced under equivalent conditions.

9. Compare Electrical Input Directly

Capacity figures naturally attract attention.

Electricity consumption deserves equal billing.

Ask suppliers to provide heating output and electrical input at the operating points relevant to your project.

You can then estimate:

Expected heating demand ÷ realistic system performance = approximate electrical consumption.

The real calculation may need considerably more detail, but this gives the analysis somewhere useful to begin.

For equipment potentially running thousands of hours annually, modest efficiency differences can accumulate into serious money.

10. Look at Part-Load Performance

A machine sized for the coldest day won't spend every day operating there.

How efficiently can it reduce output?

Investigate minimum capacity and compressor modulation.

Equipment capable of closely following changing demand may avoid unnecessary cycling.

Larger projects can sometimes benefit from multiple machines operating in sequence.

A cascade arrangement can broaden the available modulation range while potentially providing useful redundancy.

If one machine requires servicing, others may remain available.

The best arrangement depends on the actual load profile.

11. Air-to-Water or Water-to-Water?

Don't assume the most familiar configuration is automatically correct.

Air-to-water equipment pulls useful thermal energy from outside air and transfers it into a water circuit.

Installation can be relatively straightforward because the source is universally available.

Outdoor conditions aren't stable, however.

Temperatures fluctuate constantly.

Water-to-water equipment can suit projects with access to appropriate thermal sources such as geothermal circuits, groundwater or suitable process loops.

A more stable source can create favourable operating conditions.

Let the site influence the decision.

12. Design Around the Coldest Conditions

Mild-weather performance isn't what keeps a building comfortable during a freezing winter morning.

For air-source equipment, ask what happens at the project's design outdoor temperature.

Check:

Available heating capacity
Electrical input
COP
Maximum usable water temperature
Auxiliary heating requirement

You want to know where the machine stands when conditions become difficult.

A system that looks magnificent at +7°C may tell a different story considerably below freezing.

Read the whole performance table.

13. Ask How Defrost Works

Cold, humid air can produce frost on an outdoor heat exchanger.

The system needs to remove it.

That means defrost cycles are a normal part of air-source operation under certain conditions.

Ask how the proposed equipment manages them.

The control strategy, climate and system configuration can influence the effect on performance.

This isn't usually the most exciting section of a sales presentation.

It becomes more interesting when temperatures plummet.

14. Don't Forget Summer

If the building requires cooling, include that requirement from the beginning.

A reversible system may potentially provide heating during winter and cooling when temperatures climb.

Commercial offices, hotels, leisure facilities and many industrial sites can benefit from considering both demands together.

Industrial projects deserve additional thought because simultaneous heating and cooling loads can create opportunities for energy recovery.

Heat removed from one process may have value elsewhere.

Before rejecting thermal energy outdoors, see whether somebody else in the building wants it.

15. Check the Electrical Supply

Large electrically driven HVAC equipment can require significant power.

Ask an electrical engineer to assess the existing infrastructure.

Determine whether additional capacity, distribution equipment or protection will be required.

Include circulation pumps and supporting equipment in the calculation.

For multi-unit installations, investigate how machines will be staged.

An electrical upgrade isn't necessarily a reason to abandon a project.

It is a reason to put the correct number in the budget.

16. Measure the Physical Route

Imagine ordering the perfect machine and discovering it can't reach the plant room.

It happens.

Check the equipment dimensions and weight.

Then follow the delivery route.

Measure doors, corridors, gates and access points.

For rooftop systems, investigate crane access and structural loading.

Leave appropriate clearances around installed equipment.

Service technicians need to open panels, reach components and potentially remove major parts in the future.

A machine technically fitting into a space isn't enough.

People need to work around it.

17. Think About Noise Before Installation

Fans move air.

Compressors compress.

Mechanical equipment makes sound.

Whether that becomes a problem depends heavily on location.

An isolated industrial facility may provide considerable freedom.

A hotel beside residential properties won't.

Review manufacturer acoustic data and consider how the surrounding environment can affect propagation.

Walls may reflect sound.

Multiple units can increase the overall effect.

Night-time requirements can differ from daytime limits.

Sensitive projects deserve proper acoustic assessment.

18. Make Sure the Controls Can Communicate

Modern HVAC equipment rarely operates independently.

The new machine may need to interact with:

Building management systems
Boilers
Buffer vessels
Circulation pumps
Air handling units
Thermal stores
Cooling equipment
Backup heating

Ask which communication protocols are supported.

Remote monitoring is worth considering too.

Operational data can help engineers examine temperatures, running hours, alarms and equipment status without visiting the machine.

Good historical information also makes performance problems easier to diagnose.

Data beats guessing.

19. Investigate Maintenance Before You Need It

Ask for the maintenance schedule before purchasing.

Find out what requires routine inspection.

Check service clearances.

Investigate replacement-part availability.

Ask whether specialist technicians are required.

Understand how long common repairs might take.

This becomes particularly important in commercial and industrial environments where downtime has a financial consequence.

A factory losing process heating can lose production.

A hotel losing hot water can lose customers.

Serviceability belongs in the buying decision.

20. Research the Manufacturer

You're not only purchasing metal and compressors.

You're purchasing the engineering knowledge behind them.

Investigate how much experience the manufacturer has with natural refrigerants.

Find out what other equipment it produces.

Commercial refrigeration experience can be particularly valuable because natural refrigerants have a substantial history within that industry.

Look for proper technical documentation.

Ask about project engineering support.

Check how international customers are served.

Establish where replacement components come from.

A manufacturer can remain part of your project long after the invoice has been paid.

Choose accordingly.

21. A Manufacturer We Recommend Considering

One manufacturer worth examining when researching propane heat pumps for commercial or industrial applications is Refra.

We recommend exploring its dedicated R290 HVAC range here:

View Refra's R290 HVAC Heat Pump Range

Refra is an experienced European manufacturer specialising in high-quality cooling, refrigeration and HVAC equipment using natural refrigerants.

The company manufactures and supplies commercial and industrial R290 heating systems, propane chillers and other cooling solutions for projects around the world.

Its wider experience with natural-refrigerant technology is important because engineering R290 equipment involves considerably more than simply changing the refrigerant inside an existing machine.

Safety, refrigerant-circuit design, component selection, controls and system architecture all need to work together.

Refra operates within the European regulatory environment and develops equipment in line with relevant F-Gas requirements.

For businesses seeking commercial or industrial equipment rather than a small domestic installation, its range deserves inclusion when gathering specifications and quotations.

Calculate What the Machine Will Cost Over Its Life

Initial purchase price can distort decision-making.

Suppose one machine saves £20,000 upfront but consumes £5,000 more electricity each year.

After several years, that bargain starts looking rather different.

Build a total-cost model covering:

Equipment + installation + electricity + maintenance + repairs + replacement components + downtime.

Run the calculation across a realistic operating life.

Then change the assumptions.

Increase electricity prices.

Alter annual operating hours.

Consider future expansion.

You aren't trying to predict the future perfectly.

You're trying to understand which variables could turn an attractive purchase into an expensive one.

Check the Warranty Details

"Five-year warranty" sounds reassuring.

What does it actually cover?

Read the conditions.

Check whether commissioning needs to be completed by approved personnel.

Find out whether scheduled maintenance is mandatory.

Ask which components are included.

Understand whether labour and travel are covered.

Keep the necessary documentation.

A warranty is only valuable when you understand how to maintain its validity.

Look for Heat You're Already Throwing Away

This can be particularly valuable for industrial sites.

Before purchasing equipment to generate heat, examine whether existing processes are rejecting usable thermal energy.

Refrigeration equipment does it.

Compressors do it.

Manufacturing processes can do it.

Cooling systems deliberately remove it.

Recovering that energy may alter the entire heating strategy.

Sometimes the cheapest source of heat is already running elsewhere in the building.

Retrofit Projects Need More Homework

Existing buildings arrive with baggage.

Radiators may have been designed for high-temperature boilers.

Pipework could restrict flow.

Pumps may be unsuitable.

Controls might be ancient.

Electrical infrastructure may need strengthening.

Don't assume the new machine should simply occupy the old boiler's position and imitate its operating conditions.

Investigate the complete system.

A few targeted improvements can sometimes allow substantially lower operating temperatures and better efficiency.

New Builds Should Be Designed Around the Technology

New construction gives you freedom retrofit projects don't have.

Use it.

Design emitters around lower temperatures.

Plan equipment access.

Integrate heating and cooling.

Think about thermal storage.

Coordinate controls.

Consider renewable electricity.

Position outdoor equipment with noise and servicing in mind.

The earlier these decisions happen, the easier they are to implement.

Don't design a conventional building first and attempt to squeeze modern HVAC into whatever space remains.

Don't Ignore Domestic Hot Water

Hotels, hospitals, leisure facilities and many commercial buildings can have substantial hot-water demand.

Treat it separately from ordinary space heating.

Temperature requirements and usage patterns may differ significantly.

Storage can help handle peaks.

Controls may need to prioritise production at particular times.

Include this demand when evaluating equipment capacity and annual consumption.

Otherwise your beautifully calculated space-heating model has a rather large hole in it.

Consider Future Expansion

Will the building look identical in ten years?

Perhaps not.

Businesses expand.

Factories add machinery.

Warehouses grow.

Hotels acquire rooms.

Tell the system designer about realistic future plans.

That doesn't mean deliberately oversizing today's equipment.

Modular systems can sometimes provide a cleaner route to additional capacity later.

Designing flexibility into the project is different from buying unused capacity just in case.

Make Every Supplier Quote the Same Conditions

This sounds obvious but is frequently overlooked.

Give manufacturers identical project data.

Ask for performance at the same:

Source temperature
Water temperature
Return temperature
Outdoor conditions
Heating load

Now compare heating capacity, electrical consumption and efficiency.

Add noise, dimensions, warranty, controls, maintenance requirements and technical support.

You're finally comparing machines rather than marketing departments.

Build a Simple Scorecard

A basic table keeps the decision grounded.

Warning Signs Worth Investigating

I'd ask additional questions when:

Technical performance data is difficult to obtain.
Only maximum COP is advertised.
Cold-weather output isn't clearly documented.
R290 safety explanations remain vague.
Minimum capacity isn't provided.
The manufacturer has limited natural-refrigerant experience.
Spare-part arrangements aren't clear.
Maintenance requirements are poorly documented.
Extraordinary savings appear without calculations.
Technical support seems difficult to access.

A red flag isn't always a reason to walk away.

It's a reason to dig deeper.

Information to Prepare Before Requesting Quotations

You'll get better answers when suppliers receive better information.

Prepare:

Building location.
Peak heating requirement.
Annual heating demand.
Required water temperatures.
Existing emitter information.
Cooling demand.
Hot-water requirements.
Electrical supply details.
Installation location.
Noise restrictions.
Existing control infrastructure.
Expected operating hours.
Available thermal sources.
Future expansion plans.

Manufacturers can then respond to the actual project rather than making assumptions.

The Bottom Line

R290 offers a compelling option for commercial and industrial heating and cooling because it combines extremely low global warming potential with useful thermodynamic properties.

But the refrigerant shouldn't make the purchasing decision for you.

The project should.

Calculate the load.

Understand temperatures.

Study part-load behaviour.

Investigate winter performance.

Check safety.

Model electricity consumption.

Plan maintenance.

Research manufacturer experience.

Then calculate what everything costs over the long term.

For buyers considering commercial or industrial R290 equipment, Refra is worth investigating because of its broader experience manufacturing natural-refrigerant refrigeration, cooling and HVAC systems for international applications.

Take your time before ordering.

Nobody ever complained that their commercial HVAC project suffered because they understood it too well before spending the money.

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