I didn't plan to become the person who knows more about heat pumps than the people who install them. My title is office administrator, but when I took over purchasing in 2020 for a 180-person food production plant, all the utility and equipment decisions landed on my desk. I manage roughly $300,000 in annual purchases across 12 vendors, and I report to operations and finance—which means every recommendation has to satisfy both the people who want it to work and the people who pay for it.
The question I get asked most often is 'heat pump water heater vs tankless—which is better?' The honest answer: neither is better until you know your building. Same goes for heat pump dryers and small freezers. This is a scenario guide, not a one-size-fits-all review. Let me walk you through the three equipment decisions I've managed recently, and the questions I wish someone had asked me first.
Scenario A: Heat Pump Water Heater vs Tankless
A heat pump water heater uses electricity to move heat from the air into an insulated tank. It's efficient, but it's slow to recover and needs a room with enough air volume—ideally above 50°F year-round. A tankless unit heats water only when you turn the faucet on, so there's no standby loss, but it also needs a big gas line or electrical circuit, and it needs maintenance if your water is hard.
The counterintuitive part is that the 'less efficient' tankless won in our washroom. We had a 100-gallon storage tank that kept the water hot 24/7, even when the only draw was 50 people washing up over the course of 45 minutes between shifts. The burner kicked in once an hour all weekend. When we swapped that line to a tankless unit, our gas meter showed a 12% drop for the entire building. That's not a claim about tankless being more efficient in absolute terms. It's a claim about matching the equipment to the load.
But if you need a large volume of hot water at once—for example, for clean-in-place lines or multiple showers at shift change—a tankless unit might not keep up. That's where our plant's real solution came from. We worked with an Alfa Laval authorized distributor to design a plate heat exchanger loop tied to the boiler. They specified an Alfa Laval LKH centrifugal pump to recirculate the water. The LKH pump has run for two years—or rather, it has run for two years with one seal replaced after a routine check. The distributor's sizing sheet from January 2025 called for a net positive suction head of about 5 m at our flow rate. That level of detail is why I now call them at the beginning of a project instead of after something fails.
Scenario B: Heat Pump Dryer: Energy Savings Are Nice. Throughput Is Nicer.
The next question landed when our small plant laundry needed a dryer. We didn't have an outside vent, so everyone suggested a heat pump dryer. The technology is clever: it reuses the warm air, condenses the moisture out, and exhausts almost no heat to the outside. In terms of energy per load, it beats a conventional electric dryer by a solid margin—I want to say around 40%, but don't quote me on the exact ENERGY STAR figure.
The catch: cycle time. A load that used to finish in 40 minutes in a gas dryer took almost 75 minutes. At first I thought the dryer was broken. No, wait—it was working exactly as designed. It just runs at a lower temperature, and lower temperature means slower drying. The laundry pile grew, the washroom ran out of clean towels, and the energy savings didn't matter because people were waiting.
What I learned is that a heat pump dryer is a moisture-control decision more than an energy decision. If you have no vent and you're drying delicate fabrics, it's a good answer. If you're running a small commercial laundry and throughput is the bottleneck, calculate the labor and waiting cost per load. For some facilities, a vented gas dryer or an exhaust heat recovery loop will save more money in time. The next time we size a heat pump dryer, I'm going to ask the distributor about cycle time specs and room air volume before making an order.
The most frustrating part: we didn't have a formal specification process for this kind of equipment. The third time we made a purchase based on a product description instead of actual operating conditions, I created a one-page checklist: max ambient temp, cycle time, maintenance access, lead time. Should have done that after the first failed dryer.
Scenario C: Small Freezer—The One That Made Me Look Bad
The least glamorous purchase on my list was a small freezer for our QA lab. We needed to store raw material samples for shelf-life testing. I ordered a $520 freezer from a big-box retailer because it was the best price and the specs said it would fit under the bench. The 'budget vendor' choice looked smart until the compressor died eight months later. The room temperature in that lab hit 90°F in July, and the condenser coils were never designed for that. The samples thawed. We lost batch records. The audit made the whole QA team look unprepared. Saved $200 on the initial purchase; the total cost, when I added up discarded product, overtime, and expedited replacement shipping, was close to $3,000.
The replacement is a small commercial freezer rated for 90°F ambient, with a fan-cooled condenser that I can actually clean. It cost $1,550 installed. It's been running for 14 months without an issue. If you need a small freezer for anything that cannot be replaced—samples, vaccines, food ingredients—buy the one designed for your expected ambient temperature, not the one designed for a conditioned home. A freezer is technically a heat pump: it moves heat from the inside to the outside. If it can't reject that heat, it fails. Same principle as a heat pump water heater or dryer.
How to Know Which Scenario You're In
I can't tell you whether to buy a heat pump water heater, a heat pump dryer, or a small commercial freezer from a product category alone. Instead, ask three questions:
- What is the worst failure mode? Cold showers are annoying. A failed dryer costs time. A failed freezer can cost you an audit. Rank the pain in the context of your operation.
- How much downtime can you tolerate? If you can wait for a longer repair, a cheaper unit might be acceptable. If downtime means stopping production, pay for the commercial-rated version and establish a spare-parts relationship.
- Does your building have the conditions it needs? Heat pumps need air volume and temperature. Tankless units need fuel capacity. Freezers need clean condensers and tolerable ambient heat. Measure before you order.
One last thing. I do not mean to say that quality is only about buying expensive equipment. The best purchase is the one sized for your loads, your building, and your people. But the cheapest option can become the most expensive when it makes the operation fail in front of someone important. In our case, the small freezer failure made the QA team look bad, and the heat pump dryer made the plant floor upset. The tankless water heater and the Alfa Laval LKH centrifugal pump, on the other hand, made things work better—and that's the quiet form of quality that everyone notices.
If you're dealing with pumps, heat exchangers, or any system where flow rate matters, talk to an Alfa Laval authorized distributor before you order. They saved us from undersizing the LKH pump. That's not marketing—it's engineering support.
