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find the right water heater
for your home
three questions. one honest answer.
step 1 of 3
where do you live?
your groundwater temperature determines how much work any unit needs to do. we look it up automatically from your zip code.
your groundwater temperature is ideal for electric tankless. electric units perform at their best in warm climates.
--°F
groundwater inlet temperature
all capacity figures assume 105°F output — a comfortable shower.
groundwater inlet temperatures across the US
step 2 of 3
what runs at the same time?
think of your busiest morning — showers running while someone washes dishes. we size for simultaneous use, not one fixture at a time.
simultaneous flow rate
all fixtures at once
0.0 GPM
showers
~1.5 GPM each
0
sinks / faucets
~0.5 GPM each
0
appliances
~1.0 GPM each
0
a common starting point: 2 showers + 1 sink running at once.
step 3 of 3
app control or keep it simple?
same power, same efficiency, same 25-year warranty — this is purely a lifestyle preference.
either way, performance is identical. you can always upgrade later.
recommended for you
opti 18
standard
great for larger homes
starting from
$629
what you can run at the same time
electrical requirements
voltage
--
breaker
--
wire size
--
panel minimum
--
all figures reflect simultaneous use at 105°F output.
compare all models
-- °F inlet temperature
why go tankless?
always ready, always on demand
cut heating costs up to 50%
heat only what you use.
90% smaller than a tank
fits where tanks can't.
25-year residential warranty
heat exchanger, sensors, and boards covered.
99.9% energy efficient
no standby heat loss.