The Rinnai® INFINITY® A20 is a high-efficiency gas continuous flow water heater designed for residential external applications, delivering endless hot water on demand. Unlike traditional electric storage cylinders, the A20 only fires up when you need hot water — making it a far more energy-efficient choice for everyday household use. With a flow rate of up to 20 litres per minute at a 25°C rise, it is well suited to small to medium households seeking reliable, cost-effective hot water without the standby losses of a storage system.
Endless Hot Water On Demand
The INFINITY® A20 delivers continuous hot water whenever you need it, with no tank to run out. Whether it’s back-to-back showers or simultaneous use across multiple outlets, the A20 keeps up with household demand.
Energy Efficient — Only On When You Need It
With an efficiency rating of 80%, the A20 only consumes gas while hot water is being used. There are no standby heat losses associated with keeping a tank of water hot, resulting in lower running costs compared to electric storage water heaters.
Available in Natural Gas or LPG
The A20 is available for both Natural Gas and LPG connections, offering flexibility across a wide range of New Zealand residential installations. Gas type must be specified at the time of purchase.
Built-In Frost Protection
Frost protection is fitted as standard and operates automatically whenever the unit is connected to power. It activates when the internal temperature drops below 3.5°C and switches off once 7°C is reached — providing reliable year-round performance even in cold climates.
Suitable for Mains and Medium Pressure Systems
The A20 is compatible with both mains and medium pressure water supply systems, making it a versatile choice for a broad range of New Zealand homes.
Technology Highlights
Direct Electronic Ignition
The A20 uses direct electronic ignition for fast, reliable startup every time hot water is called for — no pilot light required.
Adjustable Temperature Settings
Choose from a range of fixed outlet temperatures — 40, 42, 50, 55, 60, and 65°C — allowing you to set the right temperature for your household’s needs and safety requirements.
Forced Flue Exhaust System
As an external unit, the A20 uses a forced flue exhaust system, safely directing combustion gases away from the building without the need for additional flue ducting.
Comprehensive Safety Devices
The A20 includes flame failure protection, boil-dry protection, overheat protection, a fusible link, a pressure relief valve, and a combustion fan RPM check — ensuring safe and reliable operation at all times.
Rinnai INFINITY A20 Gas Continuous Flow Water Heater
$4,726.70 Incl GST
The price listed is for supply only. For supply & installation please call us on 0800 234 800 or get an online quote here.
Description
The Rinnai® INFINITY® A20 is a high-efficiency gas continuous flow water heater designed for residential external applications, delivering endless hot water on demand. Unlike traditional electric storage cylinders, the A20 only fires up when you need hot water — making it a far more energy-efficient choice for everyday household use. With a flow rate of up to 20 litres per minute at a 25°C rise, it is well suited to small to medium households seeking reliable, cost-effective hot water without the standby losses of a storage system.
Endless Hot Water On Demand
The INFINITY® A20 delivers continuous hot water whenever you need it, with no tank to run out. Whether it’s back-to-back showers or simultaneous use across multiple outlets, the A20 keeps up with household demand.
Energy Efficient — Only On When You Need It
With an efficiency rating of 80%, the A20 only consumes gas while hot water is being used. There are no standby heat losses associated with keeping a tank of water hot, resulting in lower running costs compared to electric storage water heaters.
Available in Natural Gas or LPG
The A20 is available for both Natural Gas and LPG connections, offering flexibility across a wide range of New Zealand residential installations. Gas type must be specified at the time of purchase.
Built-In Frost Protection
Frost protection is fitted as standard and operates automatically whenever the unit is connected to power. It activates when the internal temperature drops below 3.5°C and switches off once 7°C is reached — providing reliable year-round performance even in cold climates.
Suitable for Mains and Medium Pressure Systems
The A20 is compatible with both mains and medium pressure water supply systems, making it a versatile choice for a broad range of New Zealand homes.
Technology Highlights
Direct Electronic Ignition
The A20 uses direct electronic ignition for fast, reliable startup every time hot water is called for — no pilot light required.
Adjustable Temperature Settings
Choose from a range of fixed outlet temperatures — 40, 42, 50, 55, 60, and 65°C — allowing you to set the right temperature for your household’s needs and safety requirements.
Forced Flue Exhaust System
As an external unit, the A20 uses a forced flue exhaust system, safely directing combustion gases away from the building without the need for additional flue ducting.
Comprehensive Safety Devices
The A20 includes flame failure protection, boil-dry protection, overheat protection, a fusible link, a pressure relief valve, and a combustion fan RPM check — ensuring safe and reliable operation at all times.
Additional information
INFA20N, INFA20L
Rinnai
Continuous Flow (Tankless)
34.9kW output (19.9-156 MJ/h input)
Preset 50°C (selectable: 40, 42, 50, 55, 60, 65°C)
Continuous Flow Gas
N/A
Outdoor
N/A
14kg
1000kPa
Opens 2060kPa / closes 1470kPa
N/A
N/A
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