Laars Heating Systems · MagnaTherm
Laars MagnaTherm MGH 3500
The Laars MagnaTherm MGH 3500 is a commercial condensing water-tube boiler and volume water heater rated 700-3,500 MBH input and 655-3,276 MBH output at 95% boiler thermal efficiency, with 56 gallons of water content and a 2478 lb shipping weight.
Key figures
- Max input
- 3,500 MBH
- Max CSA output
- 3,276 MBH
- AFUE
- —
- Min input
- 700 MBH
Input is gas energy consumed; output is heat delivered. Never size from input alone.
Laars MagnaTherm MGH 3500 in practice
The MGH 3500 is the 3,500 MBH size of Laars' MagnaTherm condensing stainless-steel water-tube platform, documented in the Document 1429 submittal and the Document 1398 I&O. The submittal sizing table lists 700-3,500 MBH input, 655-3,276 MBH output, 95% boiler thermal efficiency and 93.6% combustion efficiency, with 56 gallons of water content and a 2478 lb shipping weight.
Every MagnaTherm carries the Laars Linc touchscreen control with auto cascade, intelligent redundancy and quick-start setup, plus Laars Vari-Prime pump control that varies boiler pump speed to hold a fixed, user-selectable temperature rise. The boiler modulates down to 20% of full fire for a 5:1 turndown, is certified for indoor and outdoor placement with natural gas and low NOx, and carries an ASME 'H' stamp at 160 psi; electrical packages cover 120, 240, 480 or 600 VAC.
Best suited to
- Large commercial hydronic loads near 3,500 MBH input
- Plants that want the Laars Linc cascade and Vari-Prime pump control
- Indoor or outdoor installations that need a small-footprint water-tube boiler
Applicability and support
- Model number
- MGH 3500
- Canadian availability
- available
- Production status
- current
- ROMA supplies
- Confirmed at consultation
- ROMA services
- Confirmed at consultation
- Warranty
- Not verified
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.
Specifications
Published specifications
Values as published by Laars Heating Systems. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, minimum | 700 MBH | Per the Document 1429 MagnaTherm submittal sizing table. |
| Input, maximum | 3,500 MBH | Per the Document 1429 MagnaTherm submittal sizing table. |
| Output | ||
| Output, minimum | 655 MBH | Per the Document 1429 MagnaTherm submittal sizing table. |
| Output, maximum | 3,276 MBH | Per the Document 1429 MagnaTherm submittal sizing table. |
| Efficiency | ||
| Efficiency (thermal) | 95 % | Boiler thermal efficiency column per the Document 1429 submittal; the volume water heater column prints 96%. |
| Efficiency (combustion) | 93.6 % | Combustion efficiency per the Document 1429 submittal. |
| Physical and connections | ||
| Shipping weight | 2,478 lb | Product weight 2278 lb, operating weight 2742 lb per the submittal. |
| Water content | 56 gal | Per the Document 1429 MagnaTherm submittal. |
| Operating limits and other | ||
| Turndown | 5:1 | The base MagnaTherm modulates down to 20% of full fire per the product page and submittal. |
Manuals
Alerts documented for this model
None documented yet.
Frequently asked questions
What are the MagnaTherm MGH 3500 ratings?
The Document 1429 submittal lists 700-3,500 MBH input, 655-3,276 MBH output and 95% boiler thermal efficiency.
What is the difference between the MagnaTherm and the MagnaTherm HTD?
Both are the same MGH 1600-4000 water-tube platform with Laars Linc and Vari-Prime, but the base MagnaTherm modulates down to 20% of full fire (5:1) while the HTD holds full 20:1 modulation on every size.
Does the MagnaTherm make domestic hot water?
The platform is offered as a boiler and a volume water heater; the Document 1429 submittal prints both boiler and VWH ratings columns, with 96% thermal efficiency in the VWH column.
Questions about the Laars MagnaTherm MGH 3500?
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
- Laars — MagnaTherm (with Laars Linc) product page · accessed September 9, 2026
- MagnaTherm Boiler Submittal, Document 1429 · 1429 · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.