Gas supply
Tankless units fire much harder than a tank when they run. If the existing line can't deliver it, the line gets upsized or the unit never hits its rating.
Family-owned · Gaithersburg Local
Tankless Water Heater Installation in Gaithersburg
Endless hot water, done with the gas sizing and venting the unit actually requires.
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What a Tankless Install Really Involves
Tankless water heater installation isn't a swap; it's a different appliance with different requirements, and that's the part most quotes gloss over. The unit needs the right gas supply, its own venting, and somewhere for condensate to drain. Get any of those wrong and you own a heater that underperforms forever. Call [(301) 834-2944](tel:+13018342944) and we'll tell you what your house needs before anyone quotes a model.
The honest version: for some homes this is straightforward, and for others the gas line is the real project and the heater is the easy part. You should know which you are before you commit.
The Four Things That Decide Your Install
Venting
These vent differently from an atmospheric tank, usually with a dedicated sealed vent run rather than a shared flue.
Condensate
Condensing units make acidic condensate that needs a drain and often neutralizing. It can't just run onto the floor.
Water hardness
Scale collects in the heat exchanger, and county water is moderately hard. Descaling becomes part of ownership; a [softener](/services/water-softener-installation) reduces how often.
Tankless installation detail in a Maryland home
Sizing Is About Simultaneous Demand
Tank capacity is a volume question; tankless is a flow question. You aren't asking how many gallons you store, you're asking how many fixtures run at once and how cold the incoming water is. A Maryland winter drops inlet temperature, which means the unit has to raise the water further and its usable flow falls at exactly the time of year you care most.
Undersizing shows up here. A unit that's fine in August struggles in January when the incoming water is much colder and two showers are running. Sizing for the cold month rather than the average is the whole trick.
If you have a large soaking tub or a household that showers simultaneously, say so up front. It changes the model, and it's cheaper to say it now than to discover it in February.
Completed tankless installation in a Maryland home
When We'd Talk You Out of It
If your only complaint is that your current tank is old, a tankless unit is an expensive answer to a cheap problem; a replacement tank is the straightforward path. If you never run out of hot water, you're paying for a benefit you won't notice.
Where tankless earns it: you genuinely run out, you want the floor space, or the tank sits somewhere that a leak would ruin. Those are real reasons.
We also service tankless units we didn't install, including descaling and error-code diagnosis. Call (301) 834-2944 with the model and the code.
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Find Out What Your House Needs
Tell us the fixture count, your fuel, and where the current heater sits. Call [(301) 834-2944](tel:+13018342944), or request a free estimate through the [contact form](/contact-us).
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FAQ Common questions
Frequently Asked Questions
Answers below
Does a tankless water heater need a bigger gas line? +
Often, yes. Tankless units have a much higher input rating than a tank when firing, and an existing line sized for a tank plus a furnace may not deliver it. That gets checked before a model is chosen, because a starved unit never reaches its rated output no matter which brand it is.
How often does a tankless unit need descaling in this area? +
It depends on hardness and how much hot water the house uses, and county water here is moderately hard enough that descaling is a real part of ownership rather than an optional extra. Homes with a softener go longer between services. We'll give you an interval based on your water rather than a generic number.
Will one unit run two showers at once? +
That depends on the model and on how cold your incoming water is. Winter is the constraint, since the unit must raise cold inlet water further and its usable flow drops. Sizing gets done for the coldest month, not the average, which is why simultaneous-use habits matter when we spec it.
Can a tankless unit go where my tank is now? +
Sometimes, and it frees the space around it either way since the unit is wall-mounted. Location is really decided by venting and condensate drainage rather than by where the old tank sat.