The unit is frequently the smaller half of what you pay.
That surprises people, and it's why tankless quotes vary so wildly for what looks like the same job. A tankless heater is not a storage tank swap. It draws gas at a rate a storage heater never approaches, it vents differently, condensing models produce liquid that needs draining, and hard water attacks the heat exchanger in a way a tank simply tolerates.
Every one of those is a separate line of work — and every one can be quietly left off a quote to make the number look competitive.
So the comparison that protects you isn't unit against unit. It's whether each quote includes the gas line, the venting, the condensate, the electrical work, the water treatment, and the service valves — or whether those arrive later as "unforeseen."
Tap the call button and tell us what you have now and what's prompting the change. You'll get the whole figure, itemised, before anything is ordered.
FlowPoint Plumbing sizes, installs, and services tankless water heaters across Emerald Isle, NC for homes and businesses.
Ask about each of these specifically. The gap between quotes is almost always here.
A tankless unit's input while running is far higher than a storage heater's, even though it runs for less time. The existing gas line frequently isn't large enough, and meter capacity has to be checked alongside everything else drawing gas at the property.
Tankless units need their own venting, correctly routed and terminated with proper clearances. Condensing models produce acidic condensate and require appropriate vent material.
Storage heater venting is rarely reusable. Where a quote assumes it is, that's a conversation worth having before work starts.
Condensing units produce condensate needing a drain and, frequently, neutralisation before discharge. A small line item that's genuinely required and easily omitted.
Gas tankless units need power for controls and ignition — usually minor.
Electric tankless is a different order entirely. Whole-house units require substantial dedicated circuits and sometimes a service upgrade, which can exceed the cost of the heater. Establish electrical capacity before anything is specified.
Scale is the primary enemy of a tankless heat exchanger. In hard water areas, treatment or a scale filter isn't an optional extra — it determines whether the unit reaches its expected life.
A proper installation includes valves allowing the unit to be flushed and descaled without draining the system. Very cheap at installation, expensive to retrofit — and their absence tells you something about how the rest was done.
"Endless hot water" is true and slightly misleading. A tankless heater won't run out — but only at the rate it can deliver.
How much you want at once, and it's cumulative. A shower running while a kitchen tap is used and a washing machine fills is three demands at the same moment.
How far the water must be lifted — your desired output minus the temperature arriving at the property.
Any unit delivers high flow at a small rise, or modest flow at a large one. It cannot do both. Every manufacturer's rating is a curve, and the headline figure is always quoted at a rise that flatters it.
Colder incoming water means a bigger lift, so a unit comfortably serving two showers in July may manage one and a half in January.
Your measured incoming temperature at its coldest, your assessed peak simultaneous demand, and the unit's output at that rise — not the brochure number.
The specification has to survive your coldest day, not your average one.
Click Here To Call Number(833) 435-3258Any quote pricing only the unit and labour is incomplete. Gas sizing, venting, condensate, electrical, treatment, and service valves are the difference between a competitive-looking number and the real one.
An honest assessment, because it isn't right for everyone.
Tankless Suits Properties Where
Spread demand, limited space, long life wantedA Storage Tank May Still Win Where
Heavy peaks, cold supply, constrained servicesTankless heaters last longer than tanks. That longevity is conditional, not automatic.
Water passes through a narrow heat exchanger at high temperature. Minerals precipitate onto those surfaces, and even a thin layer insulates the exchanger, reduces output, forces the unit to work harder, and eventually triggers error codes and failure.
Annually as a baseline, more frequently in hard water or high-use commercial settings. Softened or treated water extends the interval considerably.
A descaling solution circulated through the exchanger via the service valves — which is precisely why those valves belong in the original installation.
Output drops gradually enough that people adjust. Then error codes appear. Then the exchanger fails, and on many units that's the most expensive component there is.
A tankless heater is low-maintenance, not no-maintenance. Units that fail early have almost always been neglected rather than badly made.
A characteristic that surprises new tankless owners.
The burner has to fire and the exchanger has to heat. Brief, but real.
Which applies to any heater — the cold water sitting between unit and tap must clear first. On a long run this is the larger part of the wait.
Where a tap is turned off and quickly on again, a slug of unheated water from the exchanger can arrive before the burner re-fires. Modern units with buffer tanks have largely reduced this.
A tankless unit needs a certain flow to fire at all. A trickle may not trigger it — worth knowing before concluding something is wrong.
A dedicated return loop, or a pump with a crossover valve, keeps hot water near the fixtures. Specify it deliberately — some units include it, some need external provision, and it changes both installation and running characteristics.
And a cheaper alternative sometimes applies: a small point-of-use unit at one remote fixture rather than recirculating the whole property.
Gas line, venting, condensate, electrical, treatment, and service valves — itemised. Not the unit and labour with the rest arriving as a surprise.
An undersized gas line makes an adequate heater behave like an inadequate one, and it's the most common hidden cost in this category.
Because a unit specified on summer conditions disappoints exactly when you need it most.
Descaling determines the unit's life, and it should never require draining the system.
Heavy simultaneous demand, very cold incoming water, or a constrained supply — sometimes storage genuinely wins.
Activation delay, pipe run, and whether recirculation is worth adding — settled beforehand rather than discovered.
Licensed, insured, and background-checked plumbers serving Emerald Isle, NC.
You'll have the sizing calculation and a fully itemised quote before anything is ordered — with every element of the installation priced separately, so you can compare like for like.
FlowPoint Plumbing proudly serves Emerald Isle, NC and the surrounding neighborhoods, sizing, installing, and servicing tankless water heaters for domestic and commercial properties throughout the area. Unsure whether you're in range? Call and ask.
Click Here To Call Number(833) 435-3258Because a tankless heater is rarely a straight swap. Gas lines frequently need upsizing, venting is different from a storage heater's, condensing units need condensate drainage, and hard water needs treatment. That's the gap in most cheap quotes, and it's better known upfront than discovered mid-job.
Almost always because of what's included. Ask each contractor specifically about gas line sizing, venting, condensate, electrical work, water treatment, and service valves. The cheapest quote is frequently the one leaving the most off.
Often, yes. Tankless units draw a high gas input while running, and a line sized for a storage heater frequently can't supply it. An undersized line means the unit can never reach full output — which is indistinguishable from having bought one that's too small.
It means it won't run out — but only at the rate the unit delivers. Exceed that with too many fixtures at once and the temperature drops rather than the supply stopping. Unlimited duration, limited rate.
Because the unit raises water temperature, and colder incoming water means a bigger lift. The same heater serving two showers comfortably in summer may manage one and a half in mid-winter. Sizing has to use the coldest case.
Two figures: how many fixtures you want running at once, and how far the water must be raised on your coldest day. Then check the manufacturer's curve at that rise — not the headline figure, which is always quoted at a flattering one.
Usually on running cost, because there's no tank kept hot around the clock. Whether it saves overall depends on installation cost, which varies enormously with gas, venting, and electrical work. We'll show you the honest picture rather than the brochure one.
For a single fixture, comfortably. For a whole house, it requires substantial electrical service, and the upgrade sometimes costs more than the heater. Worth establishing capacity before anything is specified.
Isolation valves letting the unit be flushed and descaled without draining the system. They cost very little at installation and a great deal to retrofit — and descaling is what determines how long the unit lasts. Their absence tells you something about the rest of the installation.
Annually as a baseline, more often in hard water or heavy commercial use. Scale on the heat exchanger reduces output, triggers error codes, and eventually destroys the most expensive component in the unit.
Two things: the unit takes a moment to fire, and the cold water already in the pipe between heater and tap has to clear — which applies to any heater. On long runs, recirculation or a point-of-use unit addresses it.
Not necessarily. A sound storage heater with years left isn't automatically worth replacing, and we'll say so. Where it's near the end of its life, or you're renovating anyway, that's the natural moment.
Gas line, venting, condensate, electrical, treatment, service valves. Six lines of work behind the unit price, all of them genuinely required, and all of them easy to leave off a quote to make a number look competitive.
FlowPoint Plumbing checks the gas supply before anything is ordered, sizes on your coldest day rather than the brochure's, itemises every element of the installation, fits service valves as standard, and tells you plainly when a storage tank is the better answer.
Tap the call button and tell us what you have now and what's prompting the change.
Click Here To Call Number(833) 435-3258