On-Demand Hot Water Without Storage Limits

Tankless Water Heater Installation & Service in Allendale  and surrounding areas for homes with high hot water demand and properties seeking energy-efficient upgrades

Michigan winters mean hot showers, dishwashers, and laundry often run simultaneously, and traditional tank systems struggle to keep up when multiple fixtures demand heated water at once. Tankless water heaters eliminate the storage component entirely, heating water only when you open a tap or start an appliance. Grand River Plumbing provides tankless water heater installation and service in Allendale and surrounding towns, helping residential customers transition to systems that deliver continuous hot water without the standby energy loss that occurs when a forty-gallon tank sits heated around the clock.


These units mount on walls, freeing floor space occupied by traditional tanks, and their compact design allows installation in closets, utility rooms, or even exterior walls with proper weatherproofing. Flow rate determines how many fixtures a tankless unit can supply simultaneously—higher-capacity models handle three or more simultaneous demands, while smaller units work well for single-bathroom homes or point-of-use applications where the heater sits near the fixture. Professional sizing accounts for inlet water temperature, which drops significantly during Allendale and Western Michigan winters, requiring larger units to achieve the same temperature rise as they would in warmer climates.


Request a consultation when considering an upgrade, so the system can be properly sized and positioned for your specific usage patterns and property layout.

What Tankless Installation Actually Accomplishes

Installing a tankless water heater requires evaluating gas line capacity or electrical service to verify the supply can handle the unit's demand during peak operation. Gas models need larger supply lines than tank heaters use because they consume more fuel per minute while firing, and electric models often require dedicated 240-volt circuits with substantial amperage. Venting must route combustion gases safely outside, and condensing models produce acidic drainage that needs proper disposal to prevent pipe damage.


Once the system is running, hot water arrives within seconds of opening the tap and continues at a consistent temperature regardless of how long you use it, because the unit heats on demand rather than drawing from a finite reserve. You can run the dishwasher, washing machine, and shower simultaneously without the temperature drop that occurs when a tank empties. Energy consumption drops because the system doesn't maintain a standing volume of heated water overnight or during hours when no one's home.


Maintenance involves descaling the heat exchanger annually to prevent mineral buildup from restricting flow, particularly in areas with hard water. Existing tankless units sometimes need repairs when flow sensors fail or when scale deposits reduce heating efficiency, but these systems typically last over twenty years with proper service. Installation costs exceed those for traditional tanks because of the additional infrastructure requirements, but the extended lifespan and energy savings offset the initial investment over time.

More about On Demand Tankless Heaters

Tankless and on‑demand water heaters are the same thing—they heat water instantly inside the unit, but that doesn’t mean hot water shows up instantly at the faucet.


The wait time is still determined by how long it takes hot water to travel through the pipes, which is why people often misunderstand the term “on‑demand.”


A tankless system does offer real advantages: endless hot water, higher energy efficiency, a longer lifespan, and a much smaller footprint compared to a tank. But the wait time at the fixture only improves if you add a recirculation loop, which keeps hot water moving so it’s ready much faster when someone opens a tap.



*We currently are licensed to install units up to 199,999 btu

Answers to Frequent Service Questions

Homeowners usually ask about performance differences, space savings, and whether tankless systems suit their specific household before committing to installation.

How does a tankless water heater provide endless hot water?

The unit heats water as it flows through the heat exchanger, using gas burners or electric coils that activate when flow sensors detect movement. As long as water continues flowing, the heater continues operating, so you never drain a reserve or wait for a tank to refill and reheat.

What flow rate do I need for a household in Allendale and it's surrounding areas?

Most showers use 2.5 gallons per minute, dishwashers consume 1.5 GPM, and washing machines average 2 GPM. Add the flow rates of fixtures you'll use simultaneously, then increase by 20 percent to account for Michigan's cold groundwater, which requires more heating capacity to reach comfortable temperatures during winter months.

Why do tankless units require annual maintenance?

Hard water minerals precipitate out of solution when heated, forming scale deposits inside the heat exchanger that restrict flow and reduce efficiency. Flushing the system with a descaling solution dissolves these deposits before they harden, maintaining full heating capacity and preventing sensor failures caused by restricted passages.

Can a tankless system replace an existing tank water heater in any home?

Installation feasibility depends on available gas pressure, electrical service capacity, and venting routes. Older homes may need gas line upgrades to supply adequate fuel flow, and some properties require electrical panel upgrades to support the amperage draw. Grand River Plumbing evaluates your current infrastructure before recommending a specific tankless model.

What happens if the power goes out?

Electric tankless units stop functioning without power, just like tank heaters with electric elements. Gas models require electricity to operate control boards and ignition systems, so they also shut down during outages unless you have a backup generator. Battery backup systems exist but add cost and complexity to the installation.

Grand River Plumbing sizes tankless systems correctly based on your household's actual demand and Allendale and Western Michigan's climate conditions, preventing undersized installations that fail to deliver adequate hot water during peak usage. Contact us to discuss whether tankless technology suits your property, and we'll provide recommendations based on your current infrastructure and long-term goals.