Tankless vs. tank water heaters on the Front Range

Every national article on tankless vs. tank assumes you live at sea level with soft water. Denver does not. Incoming water in January can sit in the 40s, hardness is high, and a unit de-rated for altitude is not the same machine you saw in the big-box aisle.

The altitude problem

Combustion appliances make less heat up here. Manufacturers publish de-rate tables for a reason. A tankless that ‘covers three showers’ in Phoenix may cover two in Erie on a cold morning, especially if you also run a dishwasher. We size by flow and temperature rise, not by the sticker on the box.

Hard water is the long game

Scale is why tankless gets a bad reputation along the Front Range. The heat exchanger is a narrow path. Skip the annual flush and you buy a new exchanger. Isolation valves at install are not optional. If a quote doesn’t include them, it isn’t a complete quote.

When a tank is still right

• The gas line cannot be upsized without opening finished walls you’re not ready to open
• You take short, sequential showers and never run out now
• The mechanical room has a drain and a pan, and you want a simpler service life
• Budget is the constraint and a good tank with an expansion tank beats a cheap tankless

What we install

Condensing tankless (Navien and peers) when the house can feed it. Quality tanks when that’s the honest job. Either way: pan, drain, expansion where the system is closed, and a conversation about maintenance before you sign.