Water Heater Installation & Replacement
Pull a worn-out tank and select the proper capacity, fuel and exhaust.
Homeowner guide
Tankless vs Tank Water Heater in Lafayette, CO Homes
Both types heat water well. The choice comes down to space, the size of the household, the gas supply and how much you want to spend up front.
By the Lafayette Plumbers team ·
How each type works
A tank unit stores 40 to 80 gallons of hot water around the clock, and when it runs low you wait for recovery. Tankless equipment heats only when a tap opens, running water through a heat exchanger as needed.
The tank loses a little heat all day, which is called standby loss. A tankless unit has none, but it must heat a lot of water quickly.
Cold incoming water
Groundwater in Colorado is cold in winter, and a tankless unit must raise it a long way. A unit rated for a certain flow at a modest temperature rise delivers less when the rise is larger.
A plumber should size the unit for winter conditions and the number of fixtures running at once. A unit sized only for summer will disappoint in January.
Gas line and venting
Gas tankless models generally want a bigger gas line than a tank heater, along with venting built for high-efficiency equipment. If the gas line is too small, a new run adds to the job. See gas line installation.
At Lafayette's altitude of about 5,266 feet, the unit must be rated for the elevation. Ask the installer to confirm the model and the settings.
Hard water and upkeep
A regional estimate lists the local water as hard, near 9 grains per gallon. Scale builds in a tankless heat exchanger, so plan on a descaling flush every year or two. See tankless service.
A tank collects sediment at the bottom and benefits from a yearly flush and an eventual anode rod check. A softener helps both types last.
Cost and lifespan
A tank heater costs less to buy and install. A tankless unit costs more up front, often with added gas and venting work, but many last longer than a tank, commonly cited at around twenty years with care.
Energy savings depend on use. A small household that uses little hot water may see a modest benefit. A large household may value the endless supply.
Tankless and tank compared
A quick look at the main trade-offs.
| Factor | Tank | Tankless |
|---|---|---|
| Upfront cost | Lower | Higher, often with gas and venting work |
| Hot water supply | Limited by tank size | Endless, capped by flow rate |
| Space | Needs floor space | Wall-mounted and compact |
| Upkeep in hard water | Yearly flush | Descaling flush every year or two |
Which to choose
Pick a tank if you want the lowest first cost, have limited gas capacity or want a simple swap. Pick tankless if you want space, endless hot water and are ready for the upfront cost and upkeep.
Ask for both quotes with the model and what each includes. See water heater installation for the process.
Upfront cost and incentives
A tankless install usually costs more at the start because of venting, gas line upgrades and the unit itself. Some utilities and programs offer rebates for efficient models. Check what is available before you buy.
Ask the contractor for a quote that lists the unit, venting, permits and removal of the old heater so you can compare fairly.
Hot water at peak times
Tankless units have a flow limit. If two showers and a washer run together, output may fall. A tank gives a reserve but runs out if used heavily.
Count your busiest hour of hot water use before choosing. That number guides sizing for either type.
Questions for your installer
Ask about the size of the gas line, the vent run, the condensate drain and the need for a dedicated circuit. Ask how the unit handles low flow and whether a recirculation option fits.
Request the model numbers and warranty terms in writing, and ask who services the unit after the install.
When to replace, not repair
A heater near the end of its typical life that needs a costly part is often better replaced. Ask the technician to compare the repair quote with the price of a new unit and explain the remaining warranty.
Planning the swap on your schedule beats an emergency at night, when choices are limited and a leak may already be spreading.
Running cost over time
A tankless unit avoids holding hot water in a tank, so it can use less energy where hot water is used lightly. A big family with heavy use sees smaller savings. Fuel prices matter too, since gas and electricity vary.
Look at the yellow energy label on each unit and compare the uniform energy factor. Higher numbers mean more efficient use of fuel.
Space and venting
A tankless unit hangs on a wall and frees floor area. Gas models need a vent made for their exhaust and often a larger gas line. Electric models need heavy circuits that an older panel may not support.
A tank heater fits where the old one stood, with simple swaps for the same fuel. Ask the installer to confirm clearances and code requirements before you decide.
Matching the heater to your household
Count the taps that may run at the same time on a busy morning, and the number of people. That tells the installer how large a tank or how many gallons per minute a tankless unit has to deliver.
A smaller home with light use can do well with a modest tank. A larger home with several bathrooms may suit tankless, or two units.
Upkeep each type needs
A tank heater needs its drain flushed and its anode rod checked. A tankless unit needs a descaling flush, more often in hard water, and a clean inlet screen.
Either type lasts longer when someone looks after it. Keep the manual and log each service.
Common questions
Answers on tankless vs tank
It can be, if it is sized for cold winter inlet water and maintained against scale.
Often a larger one. The installer can check.
Many have freeze protection, but they need power and a heated space.
Often a decade or more, depending on water and care.
Related services
Tankless Water Heater Service
Descale a tankless unit, clear its error codes or replace it with a new one.
Gas Line Installation & Repair
Install or mend gas piping to a stove, dryer, fireplace, barbecue or generator.
More plumbing guides
Hard water: signs and fixes
Hard Front Range water leaves scale on fixtures and shortens the life of heaters. Learn how to spot it and what to do.
Water heater leaking at the base
A puddle under the heater may come from a loose fitting or from a tank that has failed. Find out which, and what to turn off.
Causes of low water pressure
Weak flow can come from one clogged aerator or a failing regulator. Work from the simplest cause to the biggest.
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Comparing water heater options?
Call, share the household size and the current unit, and ask for quotes.
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