Canada-wide gas boiler information · On-site service in Greater Vancouver, BC
Boilers.ca is a brand of ROMA Heating & Cooling · Licensed gas contractor LGA0202903
Slant/Fin · Series
The CHS Series is Slant/Fin's high-efficiency fire-tube CONDENSING gas boiler line, held in the official library's active 'Boilers' section (breadcrumb 'Boilers > CHS Series'): eight models CHS-85 through CHS-399 at 95.0% AFUE (95.4% thermal on CHS-340/399) with up to 10:1 turndown, direct spark ignition, outdoor reset and lead-lag up to 8 boilers. The hub also hosts the official 2018 CHS recall notices, which owners should review.
Series facts
95.0% AFUE printed for CHS-85 through CHS-285 in the official submittal ratings table; the CHS-340/399 rows print 95.4% as thermal efficiency.
The CHS Series is Slant/Fin's high-efficiency fire-tube condensing gas boiler line, documented on the hub at slantfin.com/library/chs/ with the official breadcrumb 'Boilers > CHS Series' — the active library section. The official submittal sheet (720) prints eight models: CHS-85, CHS-110, CHS-154, CHS-175, CHS-201, CHS-285, CHS-340 and CHS-399, from 85 to 399 MBH input. Slant/Fin prints no 'current' or 'discontinued' sentence; section placement is the only official status wording, so Boilers.ca describes the line as current library / documents available on slantfin.com without asserting current production.
The submittal ratings table prints input of 17/17.6–85/88 MBH NG/LP on the CHS-85, 21.6/22.6–108/113 on the CHS-110, and single ranges on the remaining sizes (15.4–154, 31–175, 20–200, 28.5–285, 39.9–340 and 39.9–399 MBH), with heating capacities of 78–380 MBH and AHRI net ratings of 68–330 MBH. CHS-85 through CHS-285 print 95.0% AFUE; the CHS-340/399 rows print 95.4% as thermal efficiency, and the CHS-340/399 heating-capacity figures are marked as gross output. Turndown is 10:1 on the CHS-201/285/340/399, 5.6:1 on the CHS-175 and 5:1 on the CHS-85/110.
Connections are 1" NPT water on CHS-85/110/154, 1¼" on CHS-175/201/285 and 1½" on CHS-340/399; gas is ½" NPT on CHS-85 through CHS-201 and ¾" on CHS-285 through CHS-399; vent/air is 3" through CHS-285 and 4" on CHS-340/399. The line uses direct spark ignition, a modulating burner, outdoor reset and DHW priority with lead-lag up to 8 boilers, is wall-standard with a floor kit option, and prints MAWP of 30 psi (80 psi on CHS-175 and up); weights run 110–250 lb with water. IMPORTANT: the hub also hosts the official 2018 CHS recall documents — a CPSC notice plus contractor and homeowner notifications; owners must open the current notices and confirm whether their unit's date range is affected, as safety notices take priority over routine service information. Gas, venting and combustion work belongs with a licensed contractor.
Highlights
Models
One canonical page per model with input, output and efficiency kept separate.
Slant/Fin
The Slant/Fin CHS-85 is the smallest size in the line of the CHS high-efficiency fire-tube condensing gas boiler series: 17–85 MBH input (NG; LP 17.6–88), 78 MBH heating capacity, a 68 MBH AHRI net rating and 95% AFUE. The CHS hub sits in Slant/Fin's active 'Boilers' library section and also hosts the official 2018 recall notices.
Slant/Fin
The Slant/Fin CHS-110 is a size in the line of the CHS high-efficiency fire-tube condensing gas boiler series: 21.6–108 MBH input (NG; LP 22.6–113), 99 MBH heating capacity, a 86 MBH AHRI net rating and 95% AFUE. The CHS hub sits in Slant/Fin's active 'Boilers' library section and also hosts the official 2018 recall notices.
Slant/Fin
The Slant/Fin CHS-154 is a size in the line of the CHS high-efficiency fire-tube condensing gas boiler series: 15.4–154 MBH input, 141 MBH heating capacity, a 123 MBH AHRI net rating and 95% AFUE. The CHS hub sits in Slant/Fin's active 'Boilers' library section and also hosts the official 2018 recall notices.
Slant/Fin
The Slant/Fin CHS-175 is a size in the line of the CHS high-efficiency fire-tube condensing gas boiler series: 31–175 MBH input, 163 MBH heating capacity, a 142 MBH AHRI net rating and 95% AFUE. The CHS hub sits in Slant/Fin's active 'Boilers' library section and also hosts the official 2018 recall notices.
Slant/Fin
The Slant/Fin CHS-201 is a size in the line of the CHS high-efficiency fire-tube condensing gas boiler series: 20–200 MBH input, 185 MBH heating capacity, a 161 MBH AHRI net rating and 95% AFUE. The CHS hub sits in Slant/Fin's active 'Boilers' library section and also hosts the official 2018 recall notices.
Slant/Fin
The Slant/Fin CHS-285 is a size in the line of the CHS high-efficiency fire-tube condensing gas boiler series: 28.5–285 MBH input, 263 MBH heating capacity, a 229 MBH AHRI net rating and 95% AFUE. The CHS hub sits in Slant/Fin's active 'Boilers' library section and also hosts the official 2018 recall notices.
Slant/Fin
The Slant/Fin CHS-340 is a size in the line of the CHS high-efficiency fire-tube condensing gas boiler series: 39.9–340 MBH input, 324 MBH gross heating capacity, a 282 MBH AHRI net rating and 95.4% thermal efficiency. The CHS hub sits in Slant/Fin's active 'Boilers' library section and also hosts the official 2018 recall notices.
Slant/Fin
The Slant/Fin CHS-399 is the largest size in the line of the CHS high-efficiency fire-tube condensing gas boiler series: 39.9–399 MBH input, 380 MBH gross heating capacity, a 330 MBH AHRI net rating and 95.4% thermal efficiency. The CHS hub sits in Slant/Fin's active 'Boilers' library section and also hosts the official 2018 recall notices.
| Specification | Slant/Fin CHS-85 | Slant/Fin CHS-110 | Slant/Fin CHS-154 | Slant/Fin CHS-175 | Slant/Fin CHS-201 | Slant/Fin CHS-285 | Slant/Fin CHS-340 | Slant/Fin CHS-399 |
|---|---|---|---|---|---|---|---|---|
| Input, minimum | 17 MBH | 21.6 MBH | 15.4 MBH | 31 MBH | 20 MBH | 28.5 MBH | 39.9 MBH | 39.9 MBH |
| Input, maximum | 85 MBH | 108 MBH | 154 MBH | 175 MBH | 200 MBH | 285 MBH | 340 MBH | 399 MBH |
| output-max | — | — | — | — | — | — | — | — |
| AFUE | 95 % | 95 % | 95 % | 95 % | 95 % | 95 % | 95.4 % | 95.4 % |
| Turndown | 5:1 | 5:1 | — | 5.6:1 | 10:1 | 10:1 | 10:1 | 10:1 |
| vent-max-3 | — | — | — | — | — | — | — | — |
| vent-max-2 | — | — | — | — | — | — | — | — |
| Weight with water | 110–250 lb (line range) | 110–250 lb (line range) | 110–250 lb (line range) | 110–250 lb (line range) | 110–250 lb (line range) | 110–250 lb (line range) | 110–250 lb (line range) | 110–250 lb (line range) |
Read the full comparison: Slant/Fin CHS-85 vs CHS-110 →
Read the full comparison: Slant/Fin CHS-110 vs CHS-154 →
Read the full comparison: Slant/Fin CHS-154 vs CHS-175 →
Read the full comparison: Slant/Fin CHS-175 vs CHS-201 →
Error codes and alerts
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 Slant/Fin boilers
Eight models as printed in the official submittal sheet: CHS-85, CHS-110, CHS-154, CHS-175, CHS-201, CHS-285, CHS-340 and CHS-399, with inputs from 17 to 399 MBH.
Yes — Slant/Fin documents the CHS as a high-efficiency fire-tube condensing gas boiler, printing 95.0% AFUE for CHS-85 through CHS-285 and 95.4% thermal efficiency for the CHS-340/399 rows in the official submittal table.
The official CHS hub hosts 2018 recall documents — a CPSC notice plus contractor and homeowner official notifications. Owners should open the current notices on slantfin.com and act on any that apply to their unit's date range.
Slant/Fin prints no 'current' or 'discontinued' sentence anywhere; the CHS sits in the active 'Boilers' library section with current documents, which Boilers.ca describes as current library / documents available on slantfin.com without asserting current production. No official Canadian-sales statement was found, so canadianStatus stays 'unknown'.
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.