Gecko Aeware In.Therm 4kw, 230 volt spa heater new model 0603-416001 replaces the old blue 0603-409001 and is itself replaced by the new blue - and is also used in Emerald Spas and Great Lakes Spas model 51008000. Comes with cord and plug.

They're blue again!  Latest in.therm heater models are back to blue. Includes the in.link cable/cord and plug type.   

*This part is being discontinued and is being replaced by 0603-421002*

Intelligent Remote Heater for IN.XM Controls
Includes 4' Cord and 48 inch communications cable. Please note that pump unions (2 inch slip with tailpiece/oring. with oring) and mounting brackets are sold separately if needed.

In.therm by Gecko is an intelligent 4.0kW remote heater that integrates electronics in its power box. It includes a built-in temperature probe and a new water flow detection feature that eliminates the need of a pressure switch. In.therm controls multiple power levels on a single element extending its lifetime by heating at high power only when needed. With no moving parts and no adjustments, in.therm is hassle free and defines new levels of reliability.

• Heater must be installed with access box on top
• Power Cord Length 48”
• Communication Cable 48”
• Minimum Flow rate is 18 GPM

Also replaces 844088 and Dynasty Spa heater 12222 or DYN12222.

This in.therm heater with the control box mounted on top also replaces the blue version model 0603-416001, this model is being replaced by 0603-421002.

This intelligent remote heating unit is also used in L.A. Spas and features a built-in temperature probe so no pressure switch is needed.

This in.therm heater works with Gecko in.xm spa packs. Note the only difference is the color red and this red one replaces the old blue one. Why? It's prettier (and newer).

Red color case is now blue again

0603-416001

The manufacturer may substitute blue or red plastics in the manufacturing process. The new ones ship with blue case again, but if it is red , it is still new.

 *This part is being discontinued and is being replaced by 0603-421002*

NOW SHIPPING the new blue case model -  bonus: now has an 8ft. long cord instead of the previous 4ft long cord.

You may also need:

Split nut 0121108020

Heater Tailpiece with gasket 417-5050