Tankless Water Heater Installation & Service in Sarasota: Is Tankless Right for Your Home?

Written by Alex Beaubien | Prestige Plumbing & Restoration

Tankless water heaters have become increasingly popular for homeowners who want an alternative to storing hot water in a conventional tank.

Instead of continuously maintaining a tank full of heated water, a tankless water heater heats water as it is needed. When a hot-water fixture opens, the unit detects the demand and begins heating water as it passes through the system.

But installing a tankless water heater is not always as simple as removing a conventional water heater and hanging a tankless unit on the wall.

The property's hot-water demand, gas or electrical capacity, water piping, venting, equipment location, condensate requirements, and installation configuration all need to be considered.

At Prestige Plumbing & Restoration, we install, replace, service, and maintain tankless water heaters throughout Sarasota, Bradenton, Venice, Lakewood Ranch, Nokomis, and surrounding Southwest Florida communities.

How Does a Tankless Water Heater Work?

A conventional water heater stores a specific amount of heated water inside a tank.

A tankless water heater operates differently.

When a hot-water fixture is opened, water begins flowing through the unit. The system detects that flow and activates its heating components.

The water is heated as it passes through the heat exchanger and then travels through the home's hot-water piping to the fixture.

When hot-water demand stops, the unit shuts down its heating operation.

Because there is no large storage tank, tankless systems are sometimes referred to as on-demand water heaters.

What Are the Advantages of a Tankless Water Heater?

Tankless water heaters can offer several advantages when they are properly selected and installed.

Potential benefits include:

• Continuous hot-water production within the unit's capacity

• Reduced need for a large storage tank

• Compact equipment size

• Wall-mounted installation

• Potential energy savings depending on usage

• Reduced standby heat loss

• Longer potential equipment life with proper maintenance

• Flexible installation possibilities

However, these advantages do not mean tankless is automatically the best choice for every property.

The existing plumbing and utility systems need to support the equipment.

Does a Tankless Water Heater Provide Unlimited Hot Water?

This requires an important distinction.

A tankless water heater does not contain a fixed tank of hot water that can be depleted in the same way as a conventional tank.

As long as the unit remains within its operating capacity, it can continue heating incoming water.

However, a tankless water heater has a maximum heating and flow capacity.

If too many fixtures demand hot water simultaneously, the unit still has limitations.

That is why proper sizing matters.

How Is a Tankless Water Heater Sized?

Tankless water heaters should not be selected based only on the number of bathrooms in a home.

Sizing can depend on:

• Expected simultaneous fixture use

• Required flow rate

• Incoming water temperature

• Desired hot-water temperature

• Number and type of fixtures

• Equipment capacity

• Household usage patterns

For example, operating one shower creates a different demand than simultaneously operating multiple showers, a washing machine, and other hot-water fixtures.

The equipment should be selected to accommodate the anticipated demand of the property.

Gas vs. Electric Tankless Water Heaters

Tankless water heaters are available in both gas and electric configurations.

The appropriate type depends on the property and its available utilities.

Gas tankless water heaters

Gas units can provide substantial hot-water capacity, but installation may require evaluation of:

• Gas-line sizing

• Available gas pressure

• Total gas demand

• Venting

• Combustion requirements

• Condensate drainage

• Electrical supply for controls

• Equipment location

Electric tankless water heaters

Electric tankless equipment eliminates gas combustion and venting requirements, but larger units can require substantial electrical capacity.

This may involve:

• Multiple breakers

• Large electrical circuits

• Appropriate wiring

• Sufficient electrical service capacity

Before converting to electric tankless equipment, the electrical system should be evaluated to determine whether it can support the required load.

Why Gas-Line Sizing Matters

One of the biggest considerations when converting from a conventional gas tank water heater to a gas tankless system is gas demand.

Tankless equipment can require a significant amount of gas while operating.

The existing gas line that adequately supplied the old tank-style water heater may not necessarily be large enough to supply the replacement tankless unit.

Gas-system evaluation can include:

• Existing pipe size

• Pipe length

• Other gas appliances

• Appliance demand

• Available gas pressure

• Meter capacity

• Proposed equipment requirements

Installing equipment without verifying that the gas system can properly support it can result in operational problems.

Why Venting Matters on Gas Tankless Water Heaters

Gas-fired tankless water heaters produce combustion gases that need to be properly vented.

The venting system needs to be appropriate for the specific equipment.

Depending on the unit, installation can involve:

• Intake piping

• Exhaust piping

• Approved vent materials

• Exterior terminations

• Required clearances

• Manufacturer-specific configurations

An existing conventional water-heater vent should not automatically be assumed suitable for a new tankless unit.

The new equipment's requirements need to be evaluated.

What Is a Condensing Tankless Water Heater?

Many modern high-efficiency gas tankless water heaters are condensing units.

These systems recover additional heat from combustion gases, which can improve efficiency.

The process also produces condensate.

That means the installation needs to account for a proper condensate drain.

Depending on the equipment and installation, condensate treatment or neutralization may also be appropriate or required.

The location of an available drain can therefore influence where the tankless unit is installed.

Can a Tank Water Heater Be Converted to Tankless?

Yes, many properties can be converted from a conventional tank-style water heater to a tankless system.

But it should be treated as a conversion project, not simply an equipment swap.

A conversion may involve modifications to:

• Water piping

• Gas piping

• Electrical supply

• Venting

• Condensate drainage

• Equipment mounting

• Shutoff valves

• Service connections

The amount of modification depends on the existing installation and the tankless unit selected.

Where Can a Tankless Water Heater Be Installed?

Tankless equipment is compact and wall mounted, which can provide flexibility in certain installations.

Possible locations can include:

• Garages

• Utility rooms

• Mechanical rooms

• Exterior locations when equipment is approved for that application

• Existing water-heater areas

However, location needs to consider more than available wall space.

We also need to consider:

• Water connections

• Gas or electrical service

• Venting

• Condensate

• Service access

• Equipment clearances

• Freeze protection where applicable

• Manufacturer requirements

Choosing the right location can make both installation and future maintenance easier.

What Is a Tankless Water Heater Service Valve Kit?

Tankless water heaters are commonly installed with service valves that allow the unit to be isolated from the building's water system.

These valves make future maintenance significantly easier.

A service-valve arrangement can allow a technician to isolate the heater and connect equipment for procedures such as flushing or descaling.

Planning for future service during the original installation can save substantial time later.

Why Tankless Water Heaters Need Maintenance

Tankless does not mean maintenance-free.

Water passing through the heat exchanger can leave mineral deposits behind.

Over time, accumulation can reduce heat-transfer efficiency and potentially affect performance.

Regular maintenance may include:

• Flushing the heat exchanger

• Removing mineral accumulation

• Inspecting filters

• Cleaning inlet screens

• Checking error codes

• Inspecting connections

• Checking venting on applicable units

• Inspecting condensate components

• Verifying operation

The appropriate maintenance interval depends on the equipment, water quality, usage, and manufacturer recommendations.

What Is Tankless Water Heater Descaling?

Tankless water-heater descaling is a maintenance procedure used to remove mineral deposits from the heat exchanger.

A service setup typically allows a cleaning solution to circulate through the heat exchanger.

This helps dissolve mineral accumulation that can develop as water repeatedly passes through the unit.

After the cleaning process, the system is flushed and returned to normal operation.

This is different from mechanical sewer descaling, which we discussed in our cast-iron drainage article.

Both are called descaling, but they involve completely different plumbing systems and procedures.

Does Sarasota Water Affect Tankless Water Heaters?

Water quality can affect any water-heating equipment.

Minerals carried by the water can accumulate on surfaces exposed to repeated heating.

Tankless heat exchangers have relatively small internal waterways and depend on efficient heat transfer.

For this reason, maintenance becomes important.

The amount and speed of mineral accumulation can vary depending on:

• Water source

• Water quality

• Water treatment

• Equipment temperature

• Household usage

• Maintenance history

Following the manufacturer's maintenance recommendations can help protect the equipment.

Why Does My Tankless Water Heater Have No Hot Water?

A tankless system can stop producing hot water for many different reasons.

Possible causes include:

• Loss of power

• Gas-supply problems

• Ignition failure

• Insufficient flow

• Clogged inlet filters

• Mineral accumulation

• Venting problems

• Sensor problems

• Control issues

• Error conditions

• Component failure

The displayed error code, when available, can provide useful diagnostic information.

Simply resetting the unit repeatedly without determining why it is faulting may not correct the underlying problem.

Why Does My Tankless Water Heater Go Hot and Cold?

Temperature fluctuations can have several potential causes.

These may include:

• Flow dropping below the unit's activation requirement

• Excessive simultaneous demand

• Mineral accumulation

• Fixture-flow problems

• Improper equipment sizing

• Plumbing crossover

• Control or sensor issues

The symptoms and equipment information need to be evaluated before determining the cause.

Tankless Water Heater Error Codes

Modern tankless water heaters contain electronic controls that monitor system operation.

When the unit detects an abnormal condition, it may display an error code.

Depending on the manufacturer, codes can relate to:

• Ignition

• Flame detection

• Venting

• Exhaust temperature

• Water flow

• Temperature sensors

• Gas supply

• Overheating

• Combustion

• Internal components

The meaning of a code varies by manufacturer and model.

The exact equipment information should be used when diagnosing the problem.

Tankless Recirculation Systems

One common misconception is that installing a tankless water heater automatically means hot water will reach every faucet instantly.

It does not.

Water still has to travel from the heater through the hot-water piping to the fixture.

If a bathroom is a significant distance from the heater, the cold water sitting in that piping still needs to move before hot water reaches the fixture.

A hot-water recirculation system may help reduce this waiting period in appropriately designed plumbing systems.

What Is Hot-Water Recirculation?

A recirculation system helps move hot water through the plumbing system so heated water is available closer to fixtures.

Depending on the system, recirculation may use:

• Dedicated return piping

• Recirculation pumps

• Timers

• Controls

• Temperature-based operation

• Built-in tankless recirculation features

Some tankless water heaters have integrated recirculation capabilities.

Others can be paired with external systems.

The plumbing configuration determines which options are available.

Tankless Water Heaters in Condominiums

Tankless conversions in condominiums require careful planning.

Potential considerations include:

• Existing electrical capacity

• Existing gas supply

• Venting possibilities

• Exterior termination restrictions

• Association requirements

• Equipment location

• Common building systems

• Water shutdown coordination

• Available service access

A tankless conversion that is straightforward in a single-family home may be significantly more complicated in a condominium.

The property should be evaluated before equipment is purchased.

Tankless Water Heaters for Commercial Properties

Tankless technology can also be used in commercial applications.

Commercial hot-water demand can differ substantially from residential usage.

Applications may include:

• Restaurants

• Offices

• Multi-family properties

• Retail facilities

• Service businesses

• Other commercial buildings

Commercial equipment selection should consider peak demand, operating hours, redundancy, utility capacity, and the consequences of losing hot-water service.

Some properties may use multiple tankless units to meet larger demands.

Tankless Water Heater Repair vs. Replacement

A malfunctioning tankless water heater does not automatically need replacement.

Depending on the problem, repair may involve:

• Cleaning filters

• Descaling

• Replacing components

• Correcting gas-supply issues

• Addressing venting problems

• Repairing water connections

• Correcting condensate problems

• Diagnosing controls or sensors

Replacement may become more practical when the equipment has significant internal failure, repeated problems, unavailable components, or no longer appropriately serves the property.

Tankless Water Heater Installation in Sarasota, Bradenton & Venice

Prestige Plumbing & Restoration provides tankless water-heater installation, repair, replacement, and maintenance throughout Sarasota, Bradenton, Venice, Lakewood Ranch, Nokomis, and surrounding Southwest Florida communities.

Our tankless water-heater services include:

• Tankless water heater installation

• Tankless water heater replacement

• Tank-to-tankless conversions

• Gas tankless water heaters

• Electric tankless water heaters

• Tankless troubleshooting

• Tankless water heater repair

• Tankless flushing

• Tankless descaling

• Service-valve installation

• Gas-line evaluation

• Water-line modifications

• Condensate drainage

• Recirculation systems

• Tankless water heaters for condominiums

• Commercial tankless water heaters

The most important part of a tankless installation happens before the equipment is mounted on the wall.

The unit needs to be properly selected for the property's hot-water demand, and the existing gas, electrical, plumbing, venting, and drainage systems need to be capable of supporting it.

About the Author

Alex Beaubien is Director of Operations & Business Development at Prestige Plumbing & Restoration. Alex works with the Prestige team coordinating tankless water-heater installations and replacements, evaluating equipment requirements, planning plumbing modifications, and coordinating residential, condominium, multi-family, and commercial plumbing projects throughout Southwest Florida.

About Alex Beaubien →