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Hydrolevel 3150 HydroStat Universal Temperature Limit and Low Water Cut-Off for Oil-Fired Boilers, 120 VAC

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Product Specifications
Electrical Data
Frequency (Hertz)
60 Hertz
Product Height (Inches)
6.25 Inches
Product Width (Inches)
4.5 Inches
Product Depth (Inches)
3 Inches
Product Weight (Pounds)
10 Pounds
Warranty Information
Parts Warranty (Years)
1 Year
Model: 3150
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Ships in 4-7 Business Days
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Hydrolevel HydroStat 3150 Universal Temperature Limit and Low Water Cut-Off for Oil-Fired Boilers, 120 VAC

The Hydrostat 3150 by Hydrolevel is designed to be used in one of two ways. By installing the Hydrostat Limit Controller on an existing immersion well, the Hydrolevel 3150 can be used as a universal replacement for common Aquastat models. Whether it's a cold start or a tankless coil boiler, this Hydrolevel limit controller is well suited to provide all the temperature functions of the control being replaced. Or, install the Hydrolevel Low Water Cutoff on a Hydrolevel Electro-Well (sold separately) to automatically activate the low water cut-off function, allowing you to add low water cut-off protection to a new or existing installation without spending additional time and costs to install a separate control.

Hydrolevel 3150 Universal Temperature Limit and Low Water Cut-Off Features:
  • Dual Function Design - HydroStat performs both high temperature limit and low water cut-off functions when installed with a Hydrolevel Electro-Well.
  • Replaces Common Aquastat Models - Can be installed on existing immersion wells to replace both cold-start and triple-action Aquastats.
  • Digital Display - Easy to read LED continually displays boiler temperature. Also displays temperature limit and differential settings during adjustment.
  • Easy to Set - Dials for setting temperature limits and differentials eliminate complicated programming.
  • Easy to Wire - Industry standard wiring designations make change-outs quick and easy. Uses the same terminal designations as common Aquastat models.
  • Advanced Micro-Controller Design - Utilizes dual thermistor technology for better accuracy, response and reliability.
  • 4 on-board diagnostic indicating lights
  • Saves time, materials and wiring
Hydrolevel 3150 Universal Temperature Limit and Low Water Cut-Off Accessories:
  • Remote Mounting - the Hydrolevel 48-101 and 48-102 Remote Mount Kits are available separately for mounting the HydroStat Control Box in a remote location. Each kit includes mounting hardware and a remote sensor.
  • Electro-Well - To enable Hydrostat's low water cut-off function, Electro-Wells are available in 4 sizes to replace standard immersion wells. The Hydrolevel EW-201, EW-202, EW-221 and EW-222 are all compatible.
Hydrolevel 3150 Universal Temperature Limit and Low Water Cut-Off Warranty:
  • 1 year
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Hydrolevel 3150 Reviews & Ratings
1 Review  Sort by 
Disappointed Customer
Most Helpful Critical Review
1 out of 51 out of 51 out of 51 out of 51 out of 5
Unit Failure
My Hydrostat 3250 unit completely failed after only 18 months in service and the manufacturer (not Ecomfort) has not responded to my complaints. The furnace kept running and running and could have caused a fire and the loss of my home had I not been home to turn it off. I would not take a chance with this unit.
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