Dimension 1 Spa Heater with Flow Switch – 01781-27

The Dimension 1 Spa Heater with Flow Switch – 01781-27 is a complete, high-performance heating unit designed for efficient water temperature regulation in many Dimension One spas. This 4.0kW heater includes an integrated flow switch to ensure safe operation, making it a reliable solution for restoring heat and protecting your spa’s internal systems.

Designed specifically for D1 hot tubs, this replacement heater is engineered for optimal compatibility with factory plumbing and electronics, helping to maintain consistent, comfortable water temperatures with minimal effort.

Reliable Heat for Your D1 Spa System

• OEM part designed for Dimension One Spas

• 4.0kW, 240V stainless steel heater assembly

• Pre-installed pressure/flow switch with cord

• Includes electrical terminal block and grounding studs

• Compact design for easy fit in existing heater housing

• Suitable for select D1 models from the early 2000s to current

Why Choose the 01781-27 Dimension 1 Spa Heater Replacement

When your spa no longer reaches the desired temperature or displays flow-related error codes, a failing heater or faulty switch is often the issue. The 01781-27 combines both the heater element and flow switch into a single, integrated unit—offering a direct-fit replacement that resolves both temperature and safety interruptions.

This all-in-one design reduces troubleshooting time and ensures dependable heat delivery in your D1 spa.

Installation Notes for the Dimension One Heater – 01781-27

Installation requires shutting off power and draining the spa. Disconnect the existing heater wiring and plumbing unions, then replace the old unit with the 01781-27 using existing fittings and electrical connections. The included flow switch plugs into compatible control systems for automatic monitoring.

Be sure to verify compatibility with your spa model and control board before purchase.

Frequently Asked Questions – 01781-27 Dimension One Spa Heater with Flow Switch

What spa models is this D1 heater compatible with?

The 01781-27 fits several Dimension One models manufactured in the 2000s and beyond. Check your owner’s manual or consult support to confirm the fit for your specific spa.

What is the function of the flow switch on this heater?

The flow switch ensures water is moving properly through the heater before allowing it to activate. It helps prevent dry firing and protects the element from damage.

How do I know if my spa heater needs to be replaced?

Common signs include water that doesn’t heat, fluctuating temperatures, flow error messages, or circuit breaker trips.

Is this heater easy to install?

It installs into the existing heater manifold using standard union connections. If you’re familiar with spa systems and electrical safety, it can be replaced without professional help.

What are the electrical specs of the 01781-27 heater?

It operates at 240 volts with a 4.0kW rating and includes wiring terminals and a grounding stud for safe connection.

Does this heater include everything I need?

Yes. The 01781-27 includes the heater, flow switch, electrical terminals, and necessary mounting hardware. Sensors may need to be reused or purchased separately, depending on your spa model.

Order the 01781-27 D1 Spa Heater with Flow Switch

Restore your spa’s heating performance with the 01781-27 Dimension One Spa Heater. With integrated safety features and reliable heat output, this unit is the perfect choice for keeping your spa comfortable and operating smoothly. Shop now for fast shipping and expert support.