The pitch for tankless is endless hot water, lower running costs and a reclaimed closet. All of that can be true. Whether it is true for you depends on things specific to this area that rarely come up in the sales conversation.
The altitude factor
Arvada sits above five thousand feet. There is less oxygen available for combustion, and gas appliances must be rated or configured for high altitude — manufacturers publish derate specifications precisely because a sea-level setup will not burn correctly up here.
This applies to both types, but it bites harder on tankless, because a tankless unit fires at a much higher input rate to heat water instantly rather than gradually. That has knock-on effects on what your existing gas supply can deliver and on venting requirements. It is one of the most common reasons a tankless install quote comes in well above what the homeowner expected.
The hard water factor
This is the one people are not told, and it matters more here than almost anywhere.
Our mineral-heavy water scales a tankless heat exchanger, and unlike a tank unit — where sediment settles harmlessly on the floor until it is flushed — scale in a tankless unit forms inside narrow passages that water has to move through quickly. Output drops, error codes appear, and left long enough it damages the exchanger.
Tankless units in hard water need descaling on a schedule, typically annually. That is either a service call every year or a job you commit to doing yourself. If that is not going to happen, a good tank unit is the better purchase — genuinely, and we would rather sell you the right thing than the more expensive thing.
The honest summary
Tankless rewards households that use a lot of hot water, plan to stay put, and will keep up with descaling. It punishes households that buy it for the idea of it and then never service it. There is no shame in a well-sized tank heater — most Arvada homes are better off with one.
Where tankless genuinely wins
- You actually run out of hot water regularly — a large household, several showers back to back, or a soaking tub that empties a tank on its own.
- You want the floor space back, which is real in a small utility room or a tight basement.
- You are staying in the house long enough for lower running costs to pay back a higher install cost.
- You will keep up with annual descaling, or you are happy to pay someone to.
Where a tank is the better buy
- Your current heater meets your needs and you simply need to replace it.
- You are moving within a few years — you will not recover the extra install cost.
- Your gas supply or venting would need significant work to support a tankless unit.
- You know you will not maintain it. This is the most common and least admitted reason.
What we will do either way
We will tell you which one we would put in our own house given your usage, your gas supply and how long you plan to stay — and if that is a straightforward tank replacement, we will say so rather than talking you upward. Whatever goes in gets configured for altitude, permitted properly, and the paperwork stays with you for when you sell.
If your existing heater is playing up rather than dead, it is worth reading what our water does to a tank first — a fair number of “time to replace” heaters are actually scaled, or need a thermocouple, and have several good years left.
Written by the team at Arvada Plumbing Co., 5760 Marshall St, Arvada, CO. Got a question this did not answer? Call (720) 743-3832 — we would rather answer it than have you guess.