Tankless Water Heater Installation Cost in Missouri
$1,400 – $4,450We estimate tankless water heater installation in Missouri at $1,400 to $4,450 for a whole-house tankless unit replacing a tank. The national estimate is $1,400 to $4,400. Missouri plumber pay is 5% above the national median, ranking 20 of 51.
Part of the job
Low
High
Parts and materials (our assumption)
$1,000
$3,000
Labor hours (our assumption)
5
10
Billed labor rate per hour
$80
$144
Estimated total
$1,400
$4,450
Our estimate, not a quote. Billed rate is the Missouri median wage from BLS (2025, $32.11 an hour) times 2.5 to 4.5 to cover payroll costs, overhead, travel and profit. How we estimate
What our assumptions are based on
Item
Sourced figure
Basis
Source
Labor hours
4 – 10
4 to 8 hours (This Old House); 6 to 10 hours (Fixr). Bob Vila says close to 3 hours; that figure is not in this range.
General information, not professional advice. Conditions, codes and prices vary. Turn off power, gas or water before any work, and hire a licensed professional when in doubt. Cost figures are our estimates, not quotes.