Licensed Maryland HVACR contractor · 41 years in Montgomery County 24/7 emergency service
Poteete HVAC · since 1985

Silver Spring, MD · Water heating

Tankless Water Heater Installation in Silver Spring, MD

Tankless conversions in Silver Spring basements — the gas line is the real project

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Local detail

Tankless Installation in Silver Spring

The constraint in this housing stock is almost never wall space, it is gas supply. A 1950s Silver Spring house was piped for a furnace, a range and a 40-gallon tank, frequently in half-inch line, and a condensing tankless unit alone can call for close to 200,000 BTU. We calculate the total connected load and the run length back to the Washington Gas meter, and we quote any upsizing before you commit rather than after the unit is on the wall.

  • Long meter-to-appliance runs in deep Woodside Park and Indian Spring lots often force a line upsize to 3/4" or 1"
  • Vent termination clearances to windows, doors and the gas meter are tight on narrow Silver Spring side yards
  • Freeing the chimney by going tankless commonly means the remaining appliance needs a liner — we plan for it

Full tankless installation process, scope and pricing detail →

Tankless water heater flow Cold water entering a flow sensor, passing through a modulating burner and heat exchanger, exiting hot on demand, with isolation service valves and a condensate drain. Cold supply Flow sensor Hot, on demand Gas — up to 199,000 BTU Modulating heat exchanger Service valves Condensate
Nothing heats until a tap opens. The two things that decide whether a tankless unit performs are the gas supply — often two or three times what the old tank drew — and the descaling interval. Isolation valves are standard on our installations because without them, that annual service becomes a plumbing project.

The housing

What we find in Silver Spring homes

Predominantly 1925–1965 brick colonials, Cape Cods and ramblers, with 1970s split-levels in Colesville and White Oak and a dense core of post-2000 high-rise condominiums downtown. A large share of pre-1955 homes were built with hydronic heat and had cooling added decades later.

  • Hot-water and one-pipe steam boilers with cast-iron radiators in pre-1955 homes
  • Converted oil-to-gas forced air, often on undersized original return ductwork
  • Gravity-furnace-era duct systems retrofitted with modern blowers they were never designed for
  • Vertical stack fan coil units and water-source heat pumps in downtown condominium towers
  • Mid-1990s and early-2000s split systems now well past expected service life

Scope of the work

  • Flow-rate sizing based on simultaneous fixture demand and Maryland winter groundwater temperature
  • Gas line load calculation from the meter, with upsizing quoted up front if required
  • Stainless steel or polypropylene venting, correctly sloped, with approved termination clearances
  • Condensate drain with neutralizer on condensing units

Utilities · Silver Spring

Electric: Pepco. Gas: Washington Gas. Water: WSSC Water. Permitting authority: Montgomery County Department of Permitting Services (DPS).

Neighborhoods covered

Downtown Silver Spring, Woodside Park, Four Corners, Forest Glen, Sligo Park Hills, Northwood Park, Kemp Mill, White Oak, Colesville, Indian Spring, Seven Oaks, Hillandale and the surrounding 20901, 20902, 20903, 20904, 20905, 20906, 20910 ZIP codes.

Local factors

Conditions that shape this job in Silver Spring

  1. Sligo Creek valley humidity and tree canopy

    Homes along the Sligo Creek corridor and in Sligo Park Hills sit in a shaded, humid microclimate. Heavy tree canopy loads condenser coils with pollen and seed fluff in spring, and the lower solar gain means these homes are frequently over-cooled by systems sized on square footage alone.

  2. Orphaned water heaters in shared chimneys

    The single most common unsafe condition we find in Silver Spring basements: an 80% furnace was replaced with a condensing unit vented out the sidewall, leaving the water heater alone in a masonry chimney sized for two appliances. It cannot establish draft, and combustion products spill into the basement. We check this on every visit.

Questions

Tankless Installation in Silver Spring — common questions

Can my existing gas line support a tankless water heater?
Sometimes, and it is the first thing we check. It depends on the pipe diameter, the total length from the Washington Gas meter, and everything else already connected. If the line cannot deliver the required BTU under full fire, the unit will drop out mid-shower — a fault that gets blamed on the water heater when the cause is the pipe.
Will a tankless unit really give me unlimited hot water?
Unlimited in duration, limited in flow rate. A correctly sized unit will run two showers indefinitely; running two showers, a dishwasher and a laundry fill simultaneously in January will exceed most residential units. Sizing on winter temperature rise is what determines whether you notice that limit.

More tankless installation questions answered on the Maryland service page →

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All 15 services in Silver Spring, MD · Tankless Water Heater Installation across Maryland

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Tankless Installation in Silver Spring? Tell us what the system is doing.

Describe the problem and we will tell you what it usually means, what it typically costs to diagnose, and when we can be there. No obligation, no scripted sales call.

Call (301) 555-0182 Request a quote

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