Tech Bulletin

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Blending hydrogen with natural gas for water and space heating applications can help decarbonization

efforts. Generally, low percentages of hydrogen (~5% by volume) have been proposed for evaluations

and can blend into existing natural gas networks.

To support the drive for a greener future and an even cleaner burning natural gas, Rinnai has tested and

evaluated the products in Table 1 below for use with natural gas-hydrogen mixture fuels without

requiring product upgrades or modifications.

Rinnai Product Product Series/Model

Natural Gas -

Hydrogen Blend

Tankless Water

Heaters

Super High-Efficiency SE+ SENSEI™ Series Models Up to 30%

Super High-Efficiency SE Series Models Up to 30%

High-Efficiency HE+ Series Models Up to 30%

High-Efficiency HE Series Models Up to 30%

V Model Series: V53De model Up to 30%

Boilers I-Series Models Up to 30%

Direct Vent Furnaces Models: EX08CT, EX11CT, EX17CT, EX22CT, EX38CT Up to 10%

Table 1. Rinnai natural gas-fired products for use with natural gas-hydrogen mixture fuels

Tests to evaluate compatibility with higher natural gas-hydrogen mixtures are in progress.

Rinnai products not listed in Table 1 above have not been tested and evaluated for use with natural

gas-hydrogen mixture fuels.

NOTE

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• • Blending hydrogen with natural gas for water and space heating applications can help decarbonization efforts. Generally, low percentages of hydrogen (~5% by volume) have been proposed for evaluations and can blend into existing natural gas networks. To support the drive for a greener future and an even cleaner burning natural gas, Rinnai has tested and evaluated the products in Table 1 below for use with natural gas-hydrogen mixture fuels without requiring product upgrades or modifications. Table 1.