Choosing between the Dayton 5Pv63 and 5Pv33 hydronic unit heaters is a matter of matching the heater to your available wall or ceiling space. Both are hydronic units, meaning they work with steam or hot water to warm the surrounding air. The 5Pv63 uses a vertical discharge layout, while the 5Pv33 is a horizontal unit. Both are listed as new, made in the US, and carry no battery requirement or California Prop 65 warning.
What to look at first
Before comparing prices, check your mounting area. Measure the available wall or ceiling space and consider where the unit will blow warm air. The 5Pv63's vertical format works when you can hang it in a spot that allows a vertical air path, such as high on a wall or suspended from the ceiling. The 5Pv33's horizontal format needs a similar mounting point but blows across the room rather than down. Knowing which orientation your space supports cuts the decision in half.
Quick verdict
If you need a vertical unit, the 5Pv63 is the direct answer. If you need a horizontal unit, the 5Pv33 is built for that mounting style. The comparison table below lays out the numbers.
Comparison at a glance
| Product | Listed Price | Airflow | Mounting | Depth | Price Bar |
|---|---|---|---|---|---|
| Dayton 5Pv63 Vertical, 595 CFM | USD 972.99 | 595 CFM | Vertical | 19.7 in | |
| Dayton 5Pv33 Horizontal, 2200 CFM | USD 1,500.00 | 2,200 CFM | Horizontal | 15.5 in |
Where each product wins
The 5Pv63 wins for projects where a vertical unit can be suspended from a wall or ceiling without obstruction. Its square footprint gives you a compact shape for tighter spots. The 5Pv33 wins for projects where a horizontal unit can span a longer area and push heat across a spacious room. It requires more horizontal clearance, but that's exactly what a large open plan offers.
Product notes
Dayton 5Pv63 Hydronic Unit Heater, Vrtcl, 595Cfm
This unit is built around a vertical design, so it fits wall or ceiling locations where a compact, square shape works. It has a 19.700-inch depth and a 19.600-inch length, giving it a relatively contained footprint. The trade-off is that its depth is the deeper of the two in this face-off, so it may need a bit more clearance from the mounting surface. For a smaller workshop, storage area, or utility room where a vertical unit can be suspended, this is the more straightforward pick. If you have limited wall or ceiling clearance, account for that depth when planning the install.
Dayton 5Pv33 Hydronic Unit Heater, 2200 Cfm, 29" H
This unit goes the horizontal route, which suits open areas where the heater can be mounted along a wall or ceiling and direct airflow across the room. It has a 29-inch overall height and a 28.200-inch length, making it a longer, lower-profile shape than the 5Pv63. It delivers 180,000 BtuH at 2 PSI steam and 118,000 BtuH at 200°F water, so the heat capacity is substantial for a large space. The limitation is that a horizontal mount needs enough open space for the discharge direction; in a cramped room, the long dimension can be harder to place. Take measurements before committing.
Final choice by use case
For a compact, vertical installation, the 5Pv63 is the natural match. For a larger, horizontal installation where heat needs to travel farther, the 5Pv33 justifies its higher listed price with more airflow and a bigger BtuH output.
