Jacuzzi RapidHeat In-Line Heater U395000 [ Bathtubs and Whirlpools, - Answered Questions & Fixed issues

This is an indication of a bad circuit board. May be caused from a surge in power.I would have a service tech come out and look at the system to determine which parts are actually nor working.US Parts Center

that is dirt build up in the system. run a 10 min cycle before using the tib.

Heaters for jacuzzi bathtubs. Click here for a list of what will work for any bathtub.Bath HeatersRodU S Parts Center888-521-6183

You do not want to install any heater upside down because if any debris gets inside the heater pressure switch while it is running it will NOT shut off once the pump shuts off.RodUS Parts Center888-521-6183

You should be abl to find a PVC reducer at Lowes or Home Depot. If they don"t have the exact size they have rubber reducing boots that have strap clamps attached to them. If that doesn't work then look up a place in your area that specializes in repairs for pools and spas, they should be more than willing to sell you what you need.

Hi,
Two things to check...is there enough flow to trip the flow sensor in the heater...the heater will only work when there is flow sensed going through the line...it needs to be in the line diredtly off of the pump before any tee's...

Also and this may sound stupid, but stranger things have happened...
The heaters are directional and they need to be installed with the flow going the correct direction... have you tried taking it out and reversing it??? The flow may be going the wrong way...

heatman101

In line heaters will not HEAT the water, they will only maintain the temperature inside the tub within a few degrees. You should not try to install the heater yourself, it would be best to have a plumber come over and give you a quote on how much it would be to install it. A plumber can look at the tub, see if there is a place that the heater can be CUT IN to the pipes, and install it. You likely won't get it to work. The inline heaters are required to be put on a GFCI circuit because they are powered in a wet environment. Unless your tub is not hardwired in to the house, and you actually have a GFCI circuit under the tub. But like I said, these do not heat the tub, they only maintain. And the life of these is not very long if you use soaps and shampoos in the tub while the heater is on. It won't take any time at all for the oils to build up on the elements, rendering it useless.

Hello Manrga,

Please check the heater element or coil of the Jacuzzi.

May be it damaged.

I have the same problem. I talked to Jacuzzi technical support and they said that they don't sell a product that will retrofit (they make the couplings a custom size to prevent this.) It's really a drag since I really don't want to install a whole new tub just to maintain water temperature. I haven't given up so if you found a solution please post.

if the heater is working then the light should be on.

no it cannot. it is a pressure heater and must be installed after the discharge of the pump

sounds like maybe a bad high limit switch. the high limit is set @ 112 degrees by default.
if it is turning your system off before it reaches that temperature then it is bad.

there is not a thermostat on the bathtub heaters. they only maintain what temperature water you start with. they are capable of heating about 2-3 degrees an hour.

Hello, I not sure if your having a problem with your current in-line heater and can't get to it to repair or replace it but, this is the most effective way of heating your tub water without adding water and I say this assuming that the heater is 220 volt and not 115volt. An on demand electric water heater would cost more money to operate then your current unit. A gas on demand heater would not function properly and would fail to provide the hot water you need. If you install a gas on demand water heater and use it to just fill your tub with hot water then you would save money in the long run and be able to use it for your whole house. Hope this information is helpful. If you have more questions please feel free to ask.

i have the same problem, checked ohm's there good at 15, why won't the rapid heat light come on letting me know t's working?

No they just haven't overloaded yet,could be fire issue,should be on seperate 20or30 amp circuits,what ever they call for

This is a bathtub heater. it is only 1500 watts. they are not meant to heat the water in a bathtub. They are considered a maintenance heater ONLY.
This style heater will maintain whatever temperature you put in the bathtub. It will only produce about 2 degrees of heater per hour.
solution: start with the water temperature where you want it to be when bathing and this heater will keep it that temperature while the pump is running and the tub is full of water.

you will have to look to see where the fitting is to install this heater.
there are two styles of heaters they use (mostly)
In-line pressure heater that installs after the discharge of the pump but before any of the jets.
the in-line Vacuum heater installs before the front of the pump in the suction line.

You will need to check where it is installed and compare that to the model number of the heater. A vacuum heater must be installed in front of the pump on the suction line coming from the suction cover inside the bathtub. If you have a WOW pump then that style of heater will not work in the suction line because the pump doesn't have enough '****' to operate the vacuum switch.
A pressure heater is installed in the pvc piping after the discharge of the pump. anywhere in that line before a the jets.

The bath heater you have is not designed to HEAT water - they only Maintain what you start with.
You need to start the bathtub with the hot water you want. It will only heat about 1-2 degrees an hour.