Heater (Laars Lite LLD325P)

david32207

New member
Aug 17, 2024
3
Jacksonville Florida
I have a Teledyne Laars heater (model LLD325P) which is really only used to heat the hot tub on my pool when I wish to do so. I live in Florida so otherwise heating my pool is unnecessary. The heater is 25 years old (pool was installed in 2000). We don' the hot tub often, but I like to test it out every now and then. It is a propane heater.

My panel has two sides, "Spa" and "Pool". One side has not worked for years, while the other has typically functioned well. When I tried most recently, I noticed I was unable to get the tub over about 101F. I tried moving the thermostat knob past the mechanical stop, which was easy to do. This actually got my temperature to 101F (it was lower before that), but I was unable to get any higher.

My belief is that a "new" panel would fix the issue, as the heater seems to be working except it does not get as hot as desire. I have looked on eBay, etc. but have been unsuccessful in finding anything. I called the local "expert" and he came over and then looked for the panel at the supply store he uses, where he said he could get one but it would be over $600. No thanks for a 25 year old heater.

So, two questions.

First, does anyone have a suggestion for where I might find a replacement (see photos) at a "reasonable" price?

Second, seeing how the heater is 25 years old, replacing it is most likely where I am heading (though, as we don't use it much, if I can find the panel at a reasonable price, I might try it), what brand/model would people recommend for a replacement? Propane gas, and it is really only used to occasionally heat up the hot tub to 103-104F.
 

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First, does anyone have a suggestion for where I might find a replacement (see photos) at a "reasonable" price?
No. Teledyne Laars has been out of the pool business for many years. Even assuming it is the temperature control assembly, (which I am not saying), you ae in for $750+++
Second, seeing how the heater is 25 years old, replacing it is most likely where I am heading (though, as we don't use it much, if I can find the panel at a reasonable price, I might try it), what brand/model would people recommend for a replacement? Propane gas, and it is really only used to occasionally heat up the hot tub to 103-104F.
Propane is not a typical heater type as propane tends to be expensive. With your lower usage, still may be an option.

Raypak, Hayward, nad Pentair MasterTemp all have propane heaters. Prices from $1500 to $4000.

Propane heaters are a commodity.
 
Zodiac, parent company of Jandy, bought Teledyne Laars pool heaters years ago.

The temperature control knobs are potentiometers, which are variable resistors. The knob moves a wiper contact along a circular resistor to indicate the desired temperature. It is an old style analog control system from the 1970s. The wiper and resistor get dirt and corrosion on it which changes the resistance and the temperature setting.

Potentiometers were used in radios and other electrical devices for controls before digital controls and transistors were invented.

Get a can of Contact Cleaner and liberally squirt it in and around the dials. Turn the dials back and forth to clean the potentiometer guts. You may just get it back to the correct temperature control.



Lots of articles and videos on the net for potentiometer cleaning.

@swamprat69 may have ideas.
 
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So, did a quick, simple cleansing with isopropyl alcohol. Seems to have worked. In fact, the non-functioning side also is working, giving me two set points. I believe a better cleaning might be in order, as the "non-functioning" side got up to about 102F, and the previously "functioning" side got to 104F with overturning the pot.