Matching a new heater to the gas, plumbing and pad you already have — and telling you honestly if yours does not need replacing yet. Serving Twinsburg, Solon, Hudson and the Route 91 corridor.
Worth asking, because a fair number of heaters we are called out to replace do not need replacing.
Usually scale insulating the exchanger. A de-lime frequently restores a heater somebody had written off.
Very often flow — a filter needing a clean, or a variable speed pump running below what the flow-switch accepts. Not the heater at all.
Igniter, gas valve or a safety interlock. Components, not the unit.
A gas heater run at too low a return temperature will condense flue gas inside the cabinet. The corrosion is real, but so is the operational cause, and replacing the unit without fixing that repeats it.
We do not use an age rule. Not eight years, not five, and not a percentage of replacement cost. Those rules answer the question without looking at the heater.
The part that actually decides it is the heat exchanger, and its condition is set by water chemistry rather than by years. Scale and corrosion are what finish exchangers, and both come from chemistry. So a heater that spent its life on well-balanced water can be sound at ten years, while one that ran at low pH can be finished at five.
Things that look terminal and are not:
Things that genuinely are terminal: a split or leaking heat exchanger, a cracked cabinet, or a unit for which parts no longer exist.
A $150 service call covers up to the first hour of diagnosis. See pool heater repair — and if the diagnosis says repair, we repair it.
The gas valve train inside a pool heater
The constraints are already on the ground, and that is mostly good news.
The gas line already carries a heater. That is the biggest single advantage over a first install, where line and meter capacity is the thing that most often expands the job. If you are replacing like-for-like, the supply is generally proven — with one caveat below.
The pad, plumbing and electrical are there. Unions, isolation valves and the mounting position all exist.
The caveat, and it matters: if you are going up in output, the existing supply may no longer be adequate. A larger BTU-rated heater draws more gas, and a line that comfortably fed the old unit can be marginal for a bigger one. We check it rather than assume, because a starved heater fails to fire reliably and runs hard.
Heat pumps are the same story electrically. Replacing a gas heater with a heat pump is not a plumbing swap — it needs adequate electrical service and a dedicated circuit, and an older panel may not have room. That is the most common surprise in a fuel-type change.
A replacement is the natural moment to fix a decision that was made badly the first time, and there are three worth reviewing.
Was it the right size? If the old heater ran constantly and never quite satisfied, it was probably undersized — and replacing it with the same output reproduces the problem for another decade. If it short-cycled, it may have been oversized. We size against the pool rather than against the label on the old unit. See pool heater installation for what goes into that.
Was it the right type? This is the big one here. If you have a heat pump and have been frustrated that it does nothing useful in April and October, that is not a fault — it is what heat pumps do as air temperature falls. Going to gas fixes it. Equally, if you only ever swim in July and August and the gas bill annoyed you, a heat pump is cheaper to run. See pool heaters.
Was it in the right place? If the old unit was awkward to drain at closing, sat where its vent bothered a window or a seating area, or was boxed in so a heat pump recirculated its own cold air, the replacement is the moment to move it.
A disconnected pool heater ready to be lifted off the pad
The old unit has to come out, and it does not simply lift off.
Gas has to be isolated and capped, electrical disconnected, plumbing broken and capped, and the unit removed from the pad — and then it has to go somewhere. Heat pumps contain refrigerant, which has to be recovered properly rather than vented.
We handle removal and disposal as part of the job. It is worth confirming that with anyone quoting you, because a quote that excludes it is not comparable to one that includes it.
Same discipline as any install, and it is where post-replacement complaints come from.
Flow set so the flow-switch is satisfied at your normal pump speed; the controller updated so the heater is actually under automation rather than wired around it; the vent checked; and the unit run through a full cycle to confirm it reaches set-point and shuts down cleanly.
Then we show you how to operate it, which sounds trivial and is not — most heaters are run worse than they need to be.
“M&G has serviced our in ground pool for the past 10+ years. Seasonal opening & closing, replacing heaters, pumps and a number of aggravating repairs that Matt & his crew have handled correctly at a fair price. Recommend highly.”
A diagnostic is $150, and a fair number of heaters we look at need a de-lime rather than replacing.
Two things, and neither is the heater.
Water chemistry. Scale and corrosion killed the last exchanger and they will kill this one, on the same timetable, unless the chemistry changes. That is the honest answer to "how long will this one last" — it depends far more on the water than on the badge. Customers on a regular chemical and equipment check get that managed and documented.
A proper close. Water left in an exchanger over a Northeast Ohio winter splits it, and a split exchanger is a replacement rather than a repair — and not a warranty matter, because it follows from how the pool was closed. A close that purges the heater rather than assuming it self-drains is the difference. See pool openings and closings.
And a cover pays for itself twice. Most of a heated pool's heat loss is from the water surface, so covering it overnight both cuts running cost and reduces how hard the heater works to hold temperature. See safety covers.
A heat exchanger tube bundle furred with calcium scale
Hayward, Pentair, Raypak, Jandy, Sta-Rite, Fluidra and Zodiac, gas and heat pump. The full list is on brands we service.
Products we install carry the full manufacturer's warranty, which varies by manufacturer and generally runs between one and three years. We do not offer a separate workmanship guarantee, and nothing on this page should be read as one.
A pool equipment pad with pump, filter and heater
M & G Pools services in-ground pools exclusively. We do not service, repair or supply equipment for above-ground pools, and we do not service hot tubs or spas.
The heat exchanger decides it, and its condition comes from water chemistry rather than age — a heater on well-balanced water can be sound at ten years while one that ran at low pH is finished at five. A split or leaking exchanger, a cracked cabinet, or a unit with no available parts is terminal. Lost output usually is not: that is normally scale, and a de-lime often restores it.
Often, but the gas supply has to be checked rather than assumed. A larger BTU-rated heater draws more gas, and a line that comfortably fed the old unit can be marginal for a bigger one — a starved heater fails to fire reliably and runs hard. It is also worth asking whether bigger is the right answer, or whether the old one was simply losing heat from an uncovered surface.
It is not a plumbing swap. A heat pump needs adequate electrical service and a dedicated circuit, and an older panel may not have room — that is the most common surprise in a fuel-type change. Worth thinking about which months you want too: a heat pump's output falls as the air cools and floors out in April and October.
Yes, as part of the job — gas isolated and capped, electrical disconnected, plumbing capped, unit removed and disposed of, and refrigerant properly recovered on a heat pump rather than vented. Worth confirming that with anyone else quoting you, because a quote that excludes removal is not comparable to one that includes it.
That depends far more on the water than on the badge. Scale and corrosion are what finish heat exchangers, and both come from chemistry — so the honest answer is that a new heater lasts as long as the chemistry and the winterizing let it. A close that purges the heater properly and consistently balanced water are the two things that decide it.
