Drainage Elbow
87 degree stainless steel drainage elbow for 3 x 5 direct vent setups.
$89.99
$99.99
GEN 3 Direct Vent 199,000 BTU Indoor Tankless Water Heater with Smart Wi-Fi
199,000 BTU Heating: Built for strong whole-home hot water demand.
10.3 GPM Flow: Delivers high-volume hot water for daily showers, kitchens, and laundry.
Smart Wi-Fi Control: Touch panel operation with connected control.
Steady Temperature: Water and gas adjust together for faster temperature control.
Overview
HW199 uses a TP2 copper heat exchanger, DC variable frequency fan, six-stage flame control, water proportional valve adjustment, and built-in safety protections including anti-freeze, dry-burn protection, flameout protection, exhaust blockage protection, and timeout shutdown.
Delivery & Returns
Eligible US returns are accepted within 30 days. Items must be unused, in original packaging, and include all accessories. For non-quality returns, return shipping may be deducted from the refund.
Quality Issue Support
If a product quality issue is reported within 30 days of receipt, Mizudo may provide a full refund or one free replacement after review.
Refund Timing
After the returned item is received and inspected, approved refunds are issued to the original payment method within 10 business days.
Installation Check
Confirm fuel type, indoor venting path, 120V power access, local code requirements, and NPT 3/4" water and gas connections before purchase. Professional installation is recommended.
Customer Support
For product questions or return support, contact Mizudo at service@mizudo.com or call 001-781-887-0291.
Direct Vent Accessories
Choose matching vent parts for a cleaner indoor tankless water heater setup.
Extension Pipe
12 inch stainless steel extension pipe for 3 x 5 direct vent kits.
$89.99
$99.99
Direct Vent Kit
Vent kit with 23 inch pipe and 87 degree elbow for tankless water heaters.
$189.99
$199.99
GEN 3 Direct Vent 199,000 BTU Indoor Tankless Water Heater with Smart Wi-Fi
Sale price$1,199.99
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GEN 3 Direct Vent 199,000 BTU Indoor Tankless Water Heater with Smart Wi-Fi
Sale price$1,199.99
Product Features
199K BTU
30L/min
Indoor
WiFi
ETL
95-149 F
120V
NG / LPG
TP2 HX
Smart
199,000 BTU for steady whole-home output
HW199 delivers up to 10.3 GPM of hot water, giving showers, sinks, and kitchen use the steady flow a busy home needs.
Wi-Fi control keeps the temperature simple
Adjust the 95-149°F range with smart control and touch operation, so daily comfort is easier to manage from the panel or app.
Built for indoor installs that feel cleaner
A TP2 copper heat exchanger, six-stage flame control, water and gas proportional adjustment, 120V power, and NG/LPG compatibility help HW199 fit a compact indoor setup.
Uses
Whole Home
Bathrooms
Kitchen
Laundry
Utility Room
Basement
Garage
Rental Homes
Specifications
Heating Capacity
199,000 BTU
Hot Water Flow
30L/min
Installation
Indoor Direct Vent
Control
Smart Wi-Fi
Temperature Range
95-149°F
Power
120V AC
Connections
NPT 3/4"
Product Size
24.8" x 15.9" x 10.4"
Heat Exchanger
TP2 Copper
Flame Control
Six-Stage
Fan System
DC Variable Frequency
Certification
ETL
Performance
Heating Capacity199,000 BTU
Hot Water Flow30L/min
Temperature Range95-149°F
Installation
Install TypeIndoor Direct Vent
ConnectionsNPT 3/4"
Power120V AC
Product Size24.8" x 15.9" x 10.4"
Smart Control
ControlSmart Wi-Fi
Fan SystemDC Variable Frequency
Flame ControlSix-Stage
Core Hardware
Heat ExchangerTP2 Copper
CertificationETL
FAQ
Questions about sizing, fuel type, venting, Wi-Fi control, and installation before choosing this 10.3 GPM indoor tankless water heater.
Contact UsIs this 10.3 GPM tankless water heater right for a large home?
Yes. With 199,000 BTU heating capacity and up to 10.3 GPM flow, this model is designed for high-demand homes with multiple hot water points.
Can it support more than one shower at the same time?
It can support strong whole-home hot water demand, but real output depends on inlet water temperature, your set temperature, gas supply, and plumbing conditions.
Is this an indoor tankless water heater?
Yes. This model is built for indoor direct vent installation. Venting, clearance, gas line sizing, and local code requirements should be checked before installation.
Do I need direct vent accessories?
Most indoor direct vent setups require compatible vent parts. Confirm your vent route first, then choose the direct vent pipe, elbow, or kit that matches the installation layout.
Should I choose natural gas or propane?
Choose the version that matches your home's gas supply. Natural gas and propane models are not interchangeable, so the fuel type should be confirmed before ordering.
What can I do with the Wi-Fi control?
Wi-Fi control lets you manage supported settings from the app, while the touch panel still gives you direct control at the unit.
Will the heater work if I do not use the app?
Yes. The unit can still be operated from its touch panel. The app adds convenience, but basic operation does not depend on Wi-Fi.
What should I check before installation?
Check the fuel type, indoor venting path, 120V power access, NPT 3/4" water and gas connections, and local code requirements. Professional installation is recommended.
Does hard water matter for a tankless water heater?
Yes. Hard water can cause scale buildup over time. If your home has hard water, regular maintenance or water treatment can help protect flow and heating performance.
