Stiebel Eltron Tempra 24 Plus 24kW Electric Tankless Water Heater
Stiebel Eltron Tempra 24 Plus 24kW Electric Tankless Water Heater Review
The Stiebel Eltron Tempra 24 Plus is a 24 kW whole-house electric tankless water heater, mid-size in Stiebel Eltron's premium German-engineered Tempra Plus line. Sits between the Tempra 12 (under-sized for whole-house in most climates) and Tempra 29 Plus (sized for 2-bath cold climates) in capacity.
Specs: 24 kW (100A continuous draw, two 50-amp double-pole breakers). Requires 200A service with reasonable headroom. Capacity: 2.9 GPM at a 60°F rise (cold-climate winter) or 4.2 GPM at a 40°F rise (Sun Belt). Stainless steel heat exchanger. 7-year warranty on heat exchanger.
The Tempra 24 Plus is right-sized for 2-bathroom warm-climate homes or 1.5-bathroom cold-climate homes with sequential demand. The premium engineering produces noticeably quieter operation than EcoSmart or Rheem RTEX, with smoother temperature modulation under varying flow conditions.
About $1,100 unit, $2,200 installed. The premium pricing reflects engineering quality — Stiebel Eltron's PID temperature control holds output within ±2°F at varying flow rates versus ±5°F for budget alternatives. Right buyer: 2-bath households wanting premium European engineering at moderate capacity. Wrong buyer: 3+ bath households (step up to Tempra 36 Plus) or budget-conscious buyers (EcoSmart ECO 24 delivers similar capacity at lower price with longer warranty).