RBI Infinite Energy² 399
The RBI Infinite Energy² 399 is a gas-fired stainless-steel condensing commercial boiler rated 399 MBH input and 376 MBH boiler output in RBI's published ratings table, with full modulation up to 20:1 and a 356 lb shipping weight.
Key figures
- Max input
- 399 MBH
- Max CSA output
- 376 MBH
- AFUE
- —
- Min input
- —
Input is gas energy consumed; output is heat delivered. Never size from input alone.
RBI Infinite Energy² 399 in practice
RBI's Infinite Energy² product page prints the 399 row as 399 MBH (117 kW) input and 376 MBH (110 kW) boiler output, in a 34.8" × 23.6" × 45.7" cabinet (885 × 600 × 1160 mm) with a 356 lb (162 kg) shipping weight.
The row lists a 4" flue, 4" air intake and 1" gas / 2" water connections. RBI describes the Infinite Energy² as a 199–1,000 MBH line built on a Radial Variable Circulation (RVC) stainless-steel heat exchanger (160 psi) with premix burners, full modulation up to 20:1, integrated cascade control for up to 8 units, PVC/CPVC/polypropylene/stainless venting and an integrated condensate neutralizer.
RBI rates the Infinite Energy² line at 95.2% AHRI Boiler Efficiency and states operating efficiencies up to 98% on the product page. The I&O manual (IE2IBIOM-3, 82-0147-001) and the series brochure are linked from the official literature library. No official Canadian-sales statement was found, so canadianStatus stays unknown.
Best suited to
- Commercial plants documenting an installed Infinite Energy² 399 against RBI's rating table
- Condensing hydronic or domestic-hot-water systems in the 399 MBH input class
- Projects that want cascade control of up to eight units
Applicability and support
- Model number
- IB/IW 399
- Canadian availability
- unknown
- 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 RBI. Units are shown with every value; notes flag conflicting sources or missing figures.
| Specification | Value | Note |
|---|---|---|
| Input | ||
| Input, maximum | 399 MBH | 117 kW, as printed in the Infinite Energy² ratings table. |
| Output | ||
| Boiler output | 376 MBH | 110 kW boiler output, as printed in the Infinite Energy² ratings table. |
| Efficiency | ||
| Efficiency (AHRI boiler) | 95.2 % | 95.2% AHRI Boiler Efficiency is printed for the Infinite Energy² line on the product page; the page text also states operating efficiencies up to 98%. |
| Venting and air | ||
| Flue vent | 4" | As printed in the Infinite Energy² ratings table. |
| Air intake | 4" | As printed in the Infinite Energy² ratings table. |
| Physical and connections | ||
| Unit depth | 34.8 in | 885 mm, as printed in the ratings table. |
| Unit width | 23.6 in | 600 mm, as printed in the ratings table. |
| Unit height | 45.7 in | 1160 mm, as printed in the ratings table. |
| Gas connection | 1" | As printed in the Infinite Energy² ratings table; connection type not printed. |
| Water connection | 2" | As printed in the Infinite Energy² ratings table; connection type not printed. |
| Shipping weight | 356 lb | 162 kg, as printed in the Infinite Energy² ratings table. |
| Operating limits and other | ||
| Turndown | up to 20:1 | Full modulation up to 20:1 printed for the Infinite Energy² line on the product page. |
Manuals
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Frequently asked questions
What are the Infinite Energy² 399 ratings?
RBI's ratings table prints 399 MBH (117 kW) input and 376 MBH (110 kW) boiler output for the IB/IW 399, with a 356 lb (162 kg) shipping weight.
Is the Infinite Energy² 399 condensing?
Yes. RBI lists it on a stainless-steel RVC heat exchanger with 95.2% AHRI Boiler Efficiency and venting in PVC, CPVC, polypropylene or stainless steel.
How much turndown does the Infinite Energy² have?
RBI prints full modulation up to 20:1 for the Infinite Energy² line, with integrated cascade control for up to eight units.
Questions about the RBI Infinite Energy² 399?
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.
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Sources and verification
- RBI — Infinite Energy² product page (ratings and dimensions table) · accessed September 9, 2026
- Infinite Energy 2 (IE2) Boiler Installation & Operation Manual, IE2IBIOM-3 (82-0147-001) (PDF) · IE2IBIOM-3 · accessed September 9, 2026
Facts checked September 9, 2026. Last updated September 9, 2026. Technical reviewer: not yet assigned.