The way to Forestall Raypak Warmth Exchanger Failure –


Image this nightmare situation: You attempt to hearth up the previous fuel heater, however your stress is spiking, the water is lukewarm, and also you would possibly even see a rising creek of water streaming out of your heater cupboard. If this has occurred to you, you already know these are all signs of a failed (or about to fail) warmth exchanger.

However we’re right here to keep away from this situation. Let’s attempt to preserve your heater working as greatest as it could actually and for so long as it could actually. Let’s focus on the stuff you completely need to keep away from exposing your heater to.

What’s a warmth exchanger?

A warmth exchanger is a collection of steel alloy tubes designed to switch vitality from a warmth supply into the water flowing inside to heat or cool it.

Warmth exchangers may be fabricated from three totally different supplies: copper, cupronickel, and titanium. The commonest sort of warmth exchanger is copper. The gentle steel permits for probably the most environment friendly warmth switch of the three steel varieties. The principle disadvantage of copper is its fragility in various water circumstances.

Its heavier obligation cousin, cupronickel, can be utilized in fuel heaters and may be safely utilized in extra opposed water circumstances and salt swimming pools. Titanium warmth exchangers have completely been utilized in warmth pumps. It is because they’re probably the most resilient of the three exchanger supplies.


Injury brought on by lack of verify valve between chlorinator and heater
  • Set up a corrosion-proof verify valve Harford Loop between the heater and chlorinator

The verify valve is a tool that opens when water is transferring however shuts when the movement halts. The sprung flapper that closes when the water stops flowing prevents water from backwashing and settling from the chlorinator into the heater. A Harford Loop does the identical job as a verify valve, particularly stopping backflush of liquid by creating an increase excessive sufficient to cease any backflow.

As you will have already learn in our article “What order ought to I set up my pool gear in?”, the chlorinator ought to all the time be put in after the heater. Putting in the heater and chlorinator in that order helps stop undiluted chlorine from rotting your exchanger. Sadly, in case your pump stops, the water will stagnate and even backwash from the chlorinator and settle within the exchanger.


Warmth Exchanger harm brought on by excessive chlorine ranges
  • Residual chlorine ranges shouldn’t exceed 5 ppm

Chlorine is improbable at killing micro organism, microbes, and every other undesired amoeba in your pool. However these nice sanitizing powers have the opposed impact of corrosion. Extended publicity to excessive concentrations of Free Chlorine ranges above 5 ppm will trigger deterioration resulting in untimely failure of the warmth exchanger.

Don’t fear, although; you possibly can nonetheless use pool shock, which is prone to take your Free Chlorine ranges above 5 ppm. Pool Shock is an excellent concentrated type of chlorine, however attributable to its lack of cyanuric acid, the impact of the shock dissipates shortly.

Balancers: pH, Alkalinity, Calcium Hardness

Unsatisfactory pH ranges
  • Pool pH stage between 7.4 and seven.8 is perfect
  • Complete Alkalinity between 100 and 150 ppm
  • Calcium Hardness 250 to 400 ppm

These balancers want to remain throughout the specified ranges, or copper warmth exchangers can start to point out indicators of degradation inside a number of months. Nonetheless, holding them inside these ranges must be comparatively straightforward as they’re the inspiration of pool water chemistry.

The way to Stability Your Pool Water

Water Chemistry For Saltwater Swimming pools

Complete Dissolved Solids (TDS)

Complete Dissolved Solids (TDS) harm
  • TDS beneath 3000 ppm – TDS in salt chlorinated swimming pools may be as excessive as 6000 ppm

Complete dissolved solids (TDS) is the measurement of something that has dissolved in your pool water, e.g., salt, calcium, natural materials, and balancers (i.e., soda ash, sequestered metals.) Primarily, it’s a measurement of how saturated your water is.
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That saturation of charged minerals within the water aggressively strips copper tubes.

In case your TDS ranges are excessive, drain a portion of your water and fill it with recent water.


  • Heater and gear are equipotential bonded
  • By no means put chlorinated tablets within the pool’s skimmer basket
  • The salt stage shouldn’t exceed 4500 ppm
  • Little or no copper within the water (.2 to .5 ppm can be thought-about excessive)

Bonding your pool gear is a should to guard your gear and swimmers. Bonding the pool and its gear prevents stray voltage from zapping something or anybody. If you’re not sure what bonding is or methods to do it, give this information a learn: How To Add a Line to the Pool Bonding Wire.

By no means ever put chlorine tablets in your pump or skimmer basket.
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This tip isn’t just for methods with heaters; any pool proprietor ought to comply with this rule. Chlorine may be very corrosive, even if you find yourself diluting it to a stage as little as 5 ppm. Whenever you place your chlorine tablets within the skimmer or pump basket, you might be mainlining undiluted chlorine immediately into your pump, filter, and heater internals. That chlorine won’t solely rot your warmth exchangers but additionally make brittle and decay your gear’s plastic internals.

Excessive salt ranges will result in extreme scaling that causes blockages within the copper tubes of the exchanger. Hold your salt stage throughout the 3000 – 3500 ppm, which is the candy spot for a lot of the salt chlorine turbines in the marketplace.

Thanks to Raypak for offering the image of examples of the after-effects of unhealthy water chemistry.

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