ComboMax ULTRA 70 – Electric Boiler & Instant Hot Water Heater: 4.5–29 kW
ComboMax ULTRA 70 – Electric Boiler & Instant Hot Water Heater: 4.5–29 kW - 4.5 KW is backordered and will ship as soon as it is back in stock.
ComboMax ULTRA – The Ultimate All-in-One Electric Boiler and Instantaneous Water Heater
Efficient, Space-Saving Heating for Residential and Multi-Unit Applications
The ComboMax ULTRA combines an electric boiler for hydronic heating with an on-demand water heater, delivering powerful, energy-efficient performance in a single compact unit. Designed for residential homes, apartments, and condominiums, this system provides reliable heat and domestic hot water while helping minimize space requirements and installation costs.
🔥 Dual-Purpose Electric Boiler + Instant Hot Water
Why install two separate units when you can get hydronic heating and domestic hot water from one high-performance system? The ComboMax ULTRA uses stored heat transfer fluid to deliver on-demand domestic hot water in under 7 seconds through its independent copper coil heat exchanger.
- Hydronic heating compatibility: Works with any standard hydronic system
- Instantaneous water heating: Heats potable water inside dedicated copper coils
- No standby loss: Domestic water is never stored, helping reduce energy use and bacteria risk
⚡ Powerful & Scalable Performance
Available in two compact sizes, the ComboMax ULTRA offers outputs from 4.5 kW to 29 kW, delivering energy-efficient heating for spaces up to 4,750 sq. ft. Its high-efficiency electric boiler is designed for applications ranging from a single-family home to multi-unit residential complexes.
💧 Superior Quality Domestic Hot Water
With instantaneous heating, potable water is continuously renewed, helping reduce the risk of bacterial contamination such as Legionella that may be associated with conventional water heaters.
- Clean, fresh water on demand
- No tank sediment or buildup
- Consistent temperature and pressure
💡 Maximized Savings, Minimal Footprint
- One-unit installation reduces plumbing, materials, and labor
- Fits in the same space as a traditional water heater
- Designed for fast, easy installation in one step
- Durable construction with a 30+ year lifespan
- 15-year warranty
- Almost maintenance-free with factory-assembled accessories
🧠 Smart Control with T2 UltraSmart® Controller
The integrated T2 UltraSmart® controller offers advanced monitoring and intuitive control for both heating and domestic hot water functions.
- Adjustable temperature setpoints
- Real-time performance monitoring
- Boost mode and fault alerts
- Visual indicators for system status
- Compatible with building automation systems
🛠️ Standard Equipment Includes
- T2 UltraSmart® Digital Controller
- Cold Water Inlet
- Domestic Hot Water Outlet
- Boiler Pressure Relief Valve
- Copper Heat Exchanger Coils
- Drain Valve
- Heating Water Inlet
- Heating Water Outlet
- Electric Heating Elements
🔧 Factory Pre-Assembled Accessories for Easy Installation
- Pressure regulator with backflow preventer
- Domestic hot water mixing valve
- Automatic air vent
- Temperature & pressure gauge
- Pressure relief valve for DHW circuit
✅ ComboMax ULTRA – The Smarter, Safer, and More Efficient Way to Heat Your Home
Whether you're upgrading your home’s heating system or designing a new build, the ComboMax ULTRA electric boiler and water heater combo delivers heating and domestic hot water performance in one compact unit. Eliminate extra equipment, reduce installation complexity, and enjoy powerful, clean, and continuous comfort from a single system.
Warranty
- 15-Year Warranty: Tank and coils
- 2-Year Warranty: Electrical and mechanical parts
Technical Documents
ComboMax ULTRA 70 – Electric Boiler & Instant Hot Water Heater:...
ComboMax ULTRA 70 – Electric Boiler & Instant Hot Water Heater: 4.5–29 kW - 4.5 KW is backordered and will ship as soon as it is back in stock.
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Let customers speak for us
The boiler works great easy install. But the tech support we got hold of was in French so not a lot of help.manual was easy to follow on wiring
Easy purchase - exactly what I needed
Plumber was very happy with it. So are we.
I’ve been using Everflux for some years now and it’s simply the best there is.
Excellent product for descaling tankless water heater.
Once again, great quick service
Good go,, 👍👍👍
Great service. Happy to find the products I needed.
Great place to order from. No complaints.
Had everything i needed and step by step directions!
Excellent product! Customer service via email was timely & supportive... Shipping was quicker than expected... Thx!
Great service, quick, my new go to store/website
Works really well, this seals well also.
Dont use too much and dont put that much heat on it.
Haven't tested when water is in the system but over all is better than oatey no 5.
I am very happy with my experience. We had a shipping issue on my first order, and after working with PLUMBESTORE, they sent me another part ASAP. The part arrived very quickly and as described.
Very good product
