When you're shopping for water heaters hydronic equipment, the choice between two Dayton unit heaters can come down to how much heat you really need and where you can mount it. The Dayton 5Pv33 and the Dayton 5YH19 are both suspended horizontal hydronic wall-and-ceiling unit heaters, but they differ in price, width, and the amount of performance information they provide. The 5Pv33 is the model with the full spec sheet-2,200 cfm airflow, 180,000 BtuH on steam, and 118,000 BtuH on hot water-while the 5YH19 is the more compact of the two. This head-to-head breaks down which heater makes sense for your shop, garage, or open work area.
Quick Verdict
If you need a hydronic unit heater with confirmed performance numbers, the Dayton 5Pv33 is the one to buy. It delivers up to 2,200 cfm and 180,000 BtuH on steam, and it spells out its connection size and fan diameter so you know exactly what you're working with. The Dayton 5YH19, on the other hand, is 11% less expensive and comes in a narrower 20-7/8-inch width, making it the smarter choice if you're fitting a heater into a tighter space. Both are new units, though the 5Pv33 is from an open-box batch that has never been used or tested.
Comparison Table
| Feature | Dayton 5Pv33 | Dayton 5YH19 |
|---|---|---|
| Price | $1,500.00 | $1,328.99 |
| Width | 24-5/8 inches | 20-7/8 inches |
| Airflow | 2,200 cfm | - |
| Steam heat output | 180,000 BtuH | - |
| Hot water heat output | 118,000 BtuH | - |
| Connection | 1-1/2-inch threaded female NPT | - |
Where Each Product Wins
Dayton 5Pv33 - The Performance Pick
The 5Pv33 is the heater to choose when your space demands a known quantity. Its airflow and heat output ratings are clearly listed, and the 1-1/2-inch threaded female NPT connection gives you a concrete plumbing interface to plan around. If you need a straightforward spec sheet for a large shop or warehouse, the 5Pv33 delivers that confidence.
Dayton 5YH19 - The Space-Saving Pick
The 5YH19 wins for installations where every inch of width matters. Its more compact frame is an advantage when you're mounting between obstructions or in a narrow bay. If you're working with a tight footprint, this is the model that gives you more room to maneuver.
Dayton 5Pv33 Hydronic Unit Heater
The 5Pv33 is the model to choose when you want a heater that doesn't leave you guessing about its capabilities. It comes with a 1-1/2-inch threaded female NPT connection, so your piping hookup is clearly defined, and the unit's airflow and heat output specifications are clearly documented, making it easy to match the heater to the heat loss of your space. The caveat is the condition: this is an open-box unit, listed as new and never used or tested, which may not appeal to shoppers who prefer a factory-sealed purchase. If you can get past that, the 5Pv33 delivers a performance profile that's easy to plan around.
Dayton 5YH19 Hydronic Unit Heater
The 5YH19 is the model that keeps the purchase simple: it's a new unit, so you can take the condition at face value. Its space-saving design gives you more flexibility when you're mounting in a tight area, and the smaller footprint is a plus if you're working with limited clearances. The trade-off is that this compact frame may not suit a location planned for a larger heater, so you'll want to confirm the dimensions work for your mounting setup. It's also the heater to grab when you're ready to move forward with a straightforward, new unit. If you're looking for a no-complication hydronic heater, the 5YH19 fits the bill.
Final Choice by Use Case
If your priority is a heater with a known airflow and BtuH rating for a large open area, the Dayton 5Pv33 is the unit to pick. Its open-box condition might bother some, but the performance spec makes it a straightforward choice. If you're fitting a heater into a tight spot, the Dayton 5YH19 is the compact, new unit that fits the bill. Measure your space, weigh the condition caveat, and let the table above guide your final call.
