Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
The PHR100-55 and PHR130-55 share the identical 55-gallon high-mass package — 260 lb, 23 x 56 x 34 in, 1-1/4" NPT supply/return, 2" (85 ft) or 3" (125 ft) venting — and differ mainly in the firing ceiling: 100,000 vs 130,000 BTU/hr. The PHR100-55 prints the line's higher 95% thermal efficiency against 94% for the PHR130-55.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | HTP PHR100-55 | HTP PHR130-55 |
|---|---|---|
| Input rate, minimum | 35 MBH | 35 MBH |
| Input rate, maximum | 100 MBH | 130 MBH |
| Thermal efficiency (as printed) | 95 % | 94 % |
| Shipping weight | 260 lb | 260 lb |
| Tank water content | 55 gal | 55 gal |
| Dimensions (W x H x D) | 23" x 56" x 34" | 23" x 56" x 34" |
| CH supply/return connection | 1-1/4" NPT (female) | 1-1/4" NPT (female) |
| Venting | 2" (85 ft) or 3" (125 ft), combined equivalent feet | 2" (85 ft) or 3" (125 ft), combined equivalent feet |
Both are 55-gallon, 260 lb high-mass units with a built-in buffer tank, 90/10 cupronickel/800H heat exchanger, 926 SIT control and a five to one turndown; LP-325 Table 4 prints the same dimensions and connections.
The retired page table prints 35,000-100,000 BTU/hr at 95% for the PHR100-55 and 35,000-130,000 at 94% for the PHR130-55 — the larger model prints one point lower.
Both share the 2" (85 ft) / 3" (125 ft) vent allowance, so the decision is whether the calculated load needs the PHR130-55's 30 MBH of extra ceiling.
The HTP PHR100-55 is the 100 MBH class model of the retired Pioneer 55-gallon high-mass condensing heater line: 35,000 to 100,000 BTU/hr input, 95% printed thermal efficiency and a 260 lb package, recorded from the official retired Pioneer table and LP-325 Table 4.
The HTP PHR130-55 is the 130 MBH class model of the retired Pioneer 55-gallon high-mass condensing heater line: 35,000 to 130,000 BTU/hr input, 94% printed thermal efficiency and a 260 lb package, recorded from the official retired Pioneer table and LP-325 Table 4.
The PHR100-55 prints 95% thermal efficiency against 94% for the PHR130-55 on the retired official table.
Yes — both are 55-gallon, 260 lb units with the same 23 x 56 x 34 in dimensions and connections.
When the heat-loss calculation needs more than the PHR100-55's 100,000 BTU/hr ceiling; below that both modulate to the same 35,000 BTU/hr floor.
A consultation includes a heat-loss review so the size is right the first time.
On-site service in Greater Vancouver, BC. ROMA lists “Open 7 days” on its site; call to confirm same-day availability.
Sources and verification
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.