Plumbing — FAQ
What size tankless water heater do I need for my home?
Calculate peak demand by adding fixture flow rates (1.5-2.5 GPM each). A 2-bathroom home typically needs 5-6 GPM. Our tests show most families need 24-27kW electric units, while singles can use 18kW. Always size up slightly to avoid temperature drop during peak use.
How much does it cost to install a tankless water heater?
Electric units cost $800-$1800 installed, including potential electrical panel upgrades. DIY 110V under-sink models cost $150-$300. Gas units run $2000-$3500. Our testing included professional installation averaging 4-6 hours for whole-house electric models.
Do I need to upgrade my electrical panel for an electric tankless heater?
Most 27kW units require three 40-amp double-pole breakers and 240V service. If your panel lacks capacity, upgrade costs $1000-$2500. The Rheem 18kW needs only two breakers, making it panel-friendly. We recommend an electrician audit before purchasing.
How long do tankless water heaters typically last?
Quality electric tankless heaters last 15-20 years—nearly double tank heaters. Our tested units feature durable copper heating elements and corrosion-resistant internals. Regular descaling every 12-18 months in hard water areas extends lifespan. All tested brands offer 5+ year heat exchanger warranties.
Can tankless water heaters work in cold climates?
Yes, but incoming water temperature affects performance. In 40°F inlet conditions, a 27kW unit delivers ~4.5 GPM at 105°F output versus 6.3 GPM in warmer climates. Our tests simulated winter conditions and confirmed all units worked, but with reduced flow. Size up for northern installations.
What maintenance is required for tankless water heaters?
Flush annually with vinegar or descaling solution to remove mineral buildup, especially in hard water areas. Clean inlet screens quarterly. Test pressure relief valves yearly. Smart units alert you via app. Our long-term tests showed descaled units maintained 98% efficiency versus 85% for neglected units.
