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Weil-McLain Boiler Ultra S4 Residential Gas Water Boiler

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Weil-McLain Hydronic heating Boiler Repair, maintenance, and replacement planning
Weil-McLain Ultra S4 Residential Gas Water Boiler product image

Technical Specifications

Product Specs

  • Brand: Weil-McLain
  • Official product name: Ultra S4 Residential Gas Water Boiler
  • Product page: https://www.weil-mclain.com/products/ultra-s4-gas-boiler/
  • High-efficiency residential gas water boiler
  • Condensing boiler product family
  • Hydronic space-heating application
  • Multiple size product family
  • Direct vent/condensing venting service planning
  • Service focus includes combustion, condensate, venting, controls and circulators
  • Confirm exact model, serial number, fuel type, venting, controls, connected equipment and installation documentation before quoting parts or replacement.
  • Model or series: Ultra S4 Residential Gas Water Boiler
  • Equipment type: Boiler
  • Product group: Hydronic heating
  • System role: Hydronic heating equipment for hot-water heating systems
  • Application: Residential or commercial hydronic heating applications when model capacity is appropriate
  • Compatibility check: Verify fuel type, venting, electrical requirements, capacity, controls, and installation clearances.
  • Verified source: weil-mclain.com

Useful troubleshooting details

  • Confirm the exact Ultra Boilers model number, serial number, capacity, voltage, refrigerant or fuel type, controls, and matched equipment.
  • Share current symptoms, alerts or error codes, recent maintenance, access notes, and whether the issue is urgent or planned.
  • For replacement planning, note comfort goals, existing equipment age, and any heat-pump, electrification, or rebate-related questions.

Service planning

How GreenFlow handles Ultra S4 Residential Gas Water Boiler requests

1

Identify the equipment

Confirm the model or series name, serial number if available, photos, and whether the unit is roof, exterior, basement, or mechanical-room equipment.

2

Describe the service issue

Share no heat, no cooling, weak airflow, error codes, alarms, leaks, noise, control problems, or comfort complaints.

3

Review access and history

Include access notes, tenant or business-hour constraints, filter status, recent repairs, and maintenance records when available.

4

Plan the next step

GreenFlow can route the request for diagnostics, repair planning, maintenance, replacement scope, or related system upgrades.

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Our Happy Customers

Jahangir R.

They were very organized to communicate and be on time to come to look at my air condition to fix it.

Murali S.

HVAC technician was punctual, followed up well, completed quick repairs, ensured the issue was resolved, and provided helpful recommendations.

Ray

Just had a service call because my tankless water heater stopped working with E110 code. Andrey located the root cause real quick and fixed the issue within half an hour, also gave reasonable recommendations for further maintenance.

Sharad W.

Green Flow and the people who work there are terrific. Vlad and Andre are excellent. Andre was very helpful. He was punctual, respectful, efficient and knowledgeable. He did not try to sell me something I didn’t need ( as others have done before). I was charged $99 which...

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