WTGO-3R - 85,000 BTU Output Cast Iron Gold Oil Boiler w/ Tankless Heater - Series 4 (Burner not included)

Weil‑McLain GV90+4 – High‑Efficiency Cast Iron/Condensing Gas Boiler (105 MBH Input)

The GV90+4 combines a robust cast iron primary heat exchanger with a condensing stainless steel secondary, delivering a DOE output of 97 MBH and a net I=B=R rating of 84 MBH. This unit achieves 91.2% AFUE, meeting ENERGY STAR® standards. Designed for hydronic heating in residential applications, it accepts natural gas or LP with included conversion hardware.

⚙️ Key Features & Performance Efficiency & Output 91.2% AFUE, 105 MBH input → 97 MBH DOE output → 84 MBH net rating weil-mclain.com +15 weil-mclain.com +15 acwholesalers.com +15 Heat Exchanger Construction Cast iron primary paired with stainless steel condensing secondary 7-pass primary and 2-pass secondary flue design for optimal heat recovery energystar.gov +14 weil-mclain.com +14 weil-mclain.com +14 weil-mclain.com +11 weil-mclain.com +11 ecomfort.com +11 Sealed Combustion/Venting Compatible with 3″ PVC/CPVC/PP venting Offers direct vent, direct exhaust, and concentric setups weil-mclain.com +7 weil-mclain.com +7 afsupply.com +7 Circulator Strategy Built-in dual circulator bypass enables operation with low return water temperatures (down to 60 °F) without external mixing valves weil-mclain.com +2 weil-mclain.com +2 ecomfort.com +2 Control & Diagnostics Integrated boiler control module with snap-in connectors, outdoor reset compatibility, system diagnostics, and pressure/temperature monitoring ???? Contractor Benefits Quick Install & Serviceability: Factory-assembled, venting options tailored to field layouts, and full access panels speed up installs and routine maintenance. Rugged & Retrofit Friendly: Cast iron build resists debris, and wide internal waterways make it ideal for older hydronic systems . Code-Compliant & Durable: CSA and ASME Section IV certified, ENERGY STAR® listed, with a comprehensive 20-year primary and 5-year secondary heat exchanger warranty . ???? Technical Summary Specification Value Model GV90+4 (382200611) Input Capacity 105,000 BTU/hr DOE Output 97,000 BTU/hr Net I=B=R Rating 84,000 BTU/hr AFUE 91.2% Venting 3″ PVC/CPVC/PP; direct vent/exhaust/concentric Fuel Natural Gas (LP conversion kit included) Ignition Sealed combustion with spark ignition Circulator Configuration Dual bypass with low return protection Warranty 20‑yr primary / 5‑yr secondary / 2‑yr parts (residential) ✅ Summary The Weil‑McLain GV90+4 offers contractors a high-efficiency, service