Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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Comparison
Verdict in brief
Both the HTP PHR100-55 and the HTP PHR160-55 belong to the HTP Pioneer (discontinued) line of condensing boilers. The HTP PHR100-55 is documented at 35–100 MBH input and 95% thermal efficiency, while the HTP PHR160-55 is documented at 40–160 MBH input and 95% thermal efficiency. HTP PHR160-55 lists 60 MBH more input than HTP PHR100-55 (160 MBH against 100 MBH). Both list the same published thermal efficiency of 95%. Both list the same published shipping weight of 260 lb.
Published manufacturer figures. Input and output are kept separate; blanks mean the manufacturer did not publish that value.
| Specification | HTP PHR100-55 | HTP PHR160-55 |
|---|---|---|
| Input rate, minimum | 35 MBH | 40 MBH |
| Input rate, maximum | 100 MBH | 160 MBH |
| Thermal efficiency (as printed) | 95 % | 95 % |
| Turndown | 5:1 | 5:1 |
| Tank water content | 55 gal | 55 gal |
| Shipping weight | 260 lb | 260 lb |
| Dimensions (W x H x D) | 23" x 56" x 34" | 23" x 56" x 34" |
| Venting | 2" (85 ft) or 3" (125 ft), combined equivalent feet | 3" (200 ft) or 4" (200 ft), combined equivalent feet |
| CH supply/return connection | 1-1/4" NPT (female) | 1-1/4" NPT (female) |
| Gas inlet connection | 3/4" NPT | 3/4" NPT |
| Maximum water pressure | 30 psi | 30 psi |
| Control | 926 SIT control with LCD display and LED indicators | 926 SIT control with LCD display and LED indicators |
| Heat exchanger | 90/10 cupronickel primary with 800H stainless steel and cupronickel secondary tubing | 90/10 cupronickel primary with 800H stainless steel and cupronickel secondary tubing |
| Warranty | 12-year limited out of the box, no registration required | 12-year limited out of the box, no registration required |
Published ratings: the HTP PHR100-55 is rated 35–100 MBH input and 95% thermal efficiency; the HTP PHR160-55 is rated 40–160 MBH input and 95% thermal efficiency. HTP PHR160-55 lists 60 MBH more input than HTP PHR100-55 (160 MBH against 100 MBH). Both list the same published thermal efficiency of 95%.
The venting differs: the HTP PHR100-55 lists 2" (85 ft) or 3" (125 ft), combined equivalent feet, while the HTP PHR160-55 lists 3" (200 ft) or 4" (200 ft), combined equivalent feet.
Both records print the same thermal efficiency (95%), turndown (5:1), boiler water content (55 gal) and shipping weight (260 lb), per the cited sources.
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 PHR160-55 is the 160 MBH class model of the retired Pioneer 55-gallon high-mass condensing heater line: 40,000 to 160,000 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 PHR160-55 lists 160 MBH, against 100 MBH on the HTP PHR100-55, per the cited documentation.
Both list the same thermal efficiency of 95%.
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.