Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
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HTP · Series
The HTP Mod Con Double Stack is a discontinued stacked commercial condensing boiler: two printed models — Mod Con 1000 (100,000-1,000,000 Btuh) and Mod Con 1700 (170,000-1,700,005 Btuh), both at 94.1% thermal efficiency — with two independent boilers working as one unit, a 10 to 1 turndown and concentric venting up to 150 ft.
Series facts
The printed model table gives 94.1% thermal efficiency for both the Mod Con 1000 and Mod Con 1700; the page copy rounds this to 'up to a 94% thermal efficiency rating' and the LP-426 submittal prints '94.1% thermal efficiency (All Models)'.
The Mod Con Double Stack is documented on the official page as a modulating condensing commercial boiler operating at up to a 94% thermal efficiency rating with a 10 to 1 turndown. Its printed model table lists two sizes: Mod Con 1000 at 100,000-1,000,000 Btuh and Mod Con 1700 at 170,000-1,700,005 Btuh, both at 94.1% thermal efficiency. The page states two independent boilers work together as one unit and that the DS uses concentric venting with one exhaust connection and up to 150 ft of vent.
The retired page prints 316L stainless steel construction with a gasketless, welded heat exchanger, ASME approval with a 150 PSI relief rating, indirect water heater integration (a storage tank converts the boiler into a volume water heater) and a 10-year limited warranty with no registration required. The LP-426 submittal adds Natural or LP gas availability, ASME 75 PSI relief valves, 10 to 1 turndown and SCAQMD low-NOx certification, and lists a stainless-to-PVC vent adapter as an accessory.
The Mod Con Double Stack is retired: it is listed on HTP's official discontinued-products index. Boilers.ca records it with productStatus 'discontinued' and canadianStatus 'unknown'; no official Canadian sales statement was found. Owners should have an installed unit serviced by a licensed contractor against lp-428-r1.
Highlights
The official page states the Mod Con 'is backed by a limited 10 year warranty, right out of the box! No registration is required.'
Models
One canonical page per model with input, output and efficiency kept separate.
The HTP Mod Con 1000 Double Stack is the 1000 MBH class model of HTP's discontinued stacked commercial condensing boiler: 100 to 1,000 Btu/hr input, 940 MBH heating capacity, 94.1% thermal efficiency and two independent boilers working as one unit in a 1010 lb stack.
The HTP Mod Con 1700 Double Stack is the 1700 MBH class model of HTP's discontinued stacked commercial condensing boiler: 170 to 1,700.005 Btu/hr input, 1600 MBH heating capacity, 94.1% thermal efficiency and two independent boilers working as one unit in a 1160 lb stack.
| Specification | HTP Mod Con 1000 Double Stack | HTP Mod Con 1700 Double Stack |
|---|---|---|
| Input rate, minimum | 100 MBH | 170 MBH |
| Input rate, maximum | 1,000 MBH | 1,700.005 MBH |
| output-max | — | — |
| afue | — | — |
| Turndown | 10:1 | 10:1 |
| vent-max-3 | — | — |
| vent-max-2 | — | — |
| weight | — | — |
Read the full comparison: HTP Mod Con 1000 Double Stack vs Mod Con 1700 Double Stack →
Error codes and alerts
No alerts documented for this series yet.
Manuals
Where ROMA provides on-site service
On-site service is currently offered in Greater Vancouver, BC, including Vancouver, Burnaby, Richmond, Surrey, Coquitlam, North Vancouver, West Vancouver, New Westminster, Port Coquitlam, Port Moody, Delta, Langley, Maple Ridge, Abbotsford, Chilliwack, White Rock, Pitt Meadows, Tsawwassen, Anmore, Lions Bay, Belcarra, Bowen Island, Mission. Everything else on this site is reference information you can use anywhere in Canada.
Services for HTP boilers
The official page table prints two models: Mod Con 1000 (100,000-1,000,000 Btuh) and Mod Con 1700 (170,000-1,700,005 Btuh), both at 94.1% thermal efficiency.
The page describes two independent boilers working together as one unit with built-in redundancy; the DS uses concentric venting with a single exhaust connection through the wall or roof.
No — HTP's discontinued-products index lists 'Mod Con Double Stack', so Boilers.ca records the series as discontinued.
Describe what the boiler is doing and get a straight answer about the next step.
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.