Quick Take
Choosing a hydronic unit heater for a shop, warehouse, or commercial space usually comes down to how much heat you need, how much room you have, and what you want to spend. These four Dayton options cover a wide range: a no-box 5Pv27, an open-box 5Pv27, a 5Pv52, and a 5Pv33. The two 5Pv27 units share the same model name, but they're in different condition descriptions, and the 5Pv52 and 5Pv33 differ in height and airflow.
Listed-Price Comparison
| Model | Listed Price | Price Bar |
| Dayton 5Pv27 27-3/4\" H (no box) | USD 250.00 | |
| Dayton 5Pv52 24\" H | USD 1,426.99 | |
| Dayton 5Pv27 27-3/4\" H (open box) | USD 769.00 | |
| Dayton 5Pv33 29\" H | USD 1,500.00 | |
Decision Matrix
| Model | Best For | Key Detail |
| 5Pv27 (no box) | The lowest listed price in this set | Condition described as no box with a dent in fins |
| 5Pv52 | A more compact 24\" unit | 1400 cfm airflow |
| 5Pv27 (open box) | A 27-3/4\" unit described as never used or tested | 2200 cfm airflow |
| 5Pv33 | Higher steam and water output | 2200 cfm airflow and 29\" height |
Product Notes
Dayton - 5Pv27 Hydronic Unit Heater 27-3/4\" H (no box)
Start here if you want access to the 5Pv27 family at the lowest listed price. The description says it has a dent in the fins and no original box, so appearance may not be as clean as the open-box 5Pv27. That said, it carries the same Dayton 5Pv27 model name and 27-3/4\" height as the other 5Pv27 option. If you don't mind a cosmetic ding and you're looking to save, this is the one to consider. The limitation to weigh is the described dent, so use the pictures to decide if it fits your standards.
Dayton 5Pv52 Hydronic Unit Heater, 24\" H
This unit stands out for its more compact 24-inch height and 1400 cfm airflow. If your mounting space is tighter than what the taller units need, this is the smaller footprint to keep in mind. It also comes from the Dayton 5Pv52 series, with depth and length dimensions listed as 13.9 and 23.1 inches, and the model number 5PV52. The trade-off is the lower airflow compared to the 2200 cfm units, so make sure 1400 cfm is enough for your area.
Dayton - 5Pv27 Hydronic Unit Heater 27-3/4\" H (open box)
This is the 5Pv27 to pick if you want the same model height as the no-box version but with a condition description that says it has never been used or tested. The listed specs include a 2200 cfm airflow and 27-3/4\" height, along with steam and water output figures of 144,000 and 104,000 BtuH. The limitation is that it's an open-box item, so it comes without the full retail packaging and the condition is described as new/other. If the cosmetic dent in the no-box version is a deal-breaker, this open-box option sits in the middle of the price range.
Dayton 5Pv33 Hydronic Unit Heater, 2200 Cfm, 29\" H
This is the tallest unit in the lineup at 29 inches, with 2200 cfm airflow and 1-1/2\" threaded female NPT connections. The listed output reaches 180,000 BtuH at 2 PSI steam and 118,000 BtuH at 200°F water, which is the highest steam output in this comparison. It also lists an OSHA-compliant fan guard. It comes from an open box and has never been used or tested. Choose it if you need the biggest heating capacity here; its limitation is the larger physical height, so measure your mounting area before committing.
Final Recommendation
Choose the no-box 5Pv27 if the budget is the top priority and the dent in the fins doesn't bother you. Choose the open-box 5Pv27 if you want the 27-3/4\" height and 2200 cfm airflow with a described never-used condition. Choose the 5Pv52 if you need a more compact 24\" unit with 1400 cfm. Choose the 5Pv33 if you need the tallest and highest-output option for a larger space.
