LRQA Independent Assurance Statement
Relating to Rinnai Corporation’s Environmental Data for the fiscal year2023
This Assurance Statement has been prepared for Rinnai Corporation in accordance with our contract.

Terms of Engagement
LRQA Limited (“LRQA”) was commissioned by Rinnai Corporation (“the Company”) to provide independent
assurance on its environmental data (“the report”) for the fiscal year 2023 1 against the assurance criteria below to alimited level of assurance and at the materiality of the professional judgement of the verifier using ISAE 3000 (Revised)
and ISO 14064-3:2019 for greenhouse gas (“GHG”) emissions.
Our assurance engagement covered the Company and its consolidated subsidiaries’ operations and activities inJapan and overseas and specifically the following requirements:• Verifying conformance with the Company’s reporting methodologies for the selected indicators:• Evaluating the accuracy and reliability of data for only the selected indicators listed below:••••

Scope 1 GHG emissions (tonnes CO2e) 2 3
Scope 2 GHG emissions [Market-based, Location-based] (tonnes CO2e)
Scope 3 GHG emissions (Category 1,2,3,4,5,6,7,8,11,12) (tonnes CO2e) 4 5 6 7Energy consumption (GJ) 8

Our assurance engagement excluded the data and information of the Company’s suppliers, contractors and any
third-parties mentioned in the report.
LRQA’s responsibility is only to the Company. LRQA disclaims any liability or responsibility to others as explained in
the end footnote. The Company’s responsibility is for collecting, aggregating, analysing and presenting all the dataand information within the report and for maintaining effective internal controls over the systems from which thereport is derived. Ultimately, the report has been approved by, and remains the responsibility of the Company.

LRQA’s Opinion
Based on LRQA’s approach nothing has come to our attention that would cause us to believe that the Company has
not, in all material respects:• Met the requirements of the Company’s reporting methodologies• Disclosed accurate and reliable environmental data as summarized in Table 1, Table 2 and Table 3 below
The opinion expressed is formed on the basis of a limited level of assurance9 and at the materiality of the professional
judgement of the verifier.

1The reporting period is based on the fiscal year of domestic and overseas subsidiary companies: (1) domestic subsidiary companies:
FY2023(01/04/2023 – 31/03/2024), and (2) overseas subsidiary companies: CY2023 (01/01/2023– 31/12/2023)
2
GHG quantification is subject to inherent uncertainty.
3
Scope1 fluorocarbon leakage cover Rinnai Corporation and consolidated subsidiaries in Japan.
4
Scope3 Category 1, 4 and 11 cover Rinnai Corporation.
5
Scope3 Category 2, 3, 5, 6 and 7 cover Rinnai Corporation and its consolidated subsidiaries in Japan and overseas.
6
Scope3 Category 12 covers Rinnai Corporation and its consolidated subsidiaries in Japan.
7The reporting period covered by Scope 3 category 12 is FY2022(01/04/2022 – 31/03/2023)
8
The scope includes the breakdown of energy consumption.
9
The extent of evidence-gathering for a limited assurance engagement is less than for a reasonable assurance engagement. Limited assurance
engagements focus on aggregated data rather than physically checking source data at sites. Consequently, the level of assurance obtained in alimited assurance engagement is lower than the assurance that would have been obtained had a reasonable assurance engagement been
performed.
Page 1 of 3

LRQA’s Approach
LRQA’s assurance engagements are carried out in accordance with ISAE 3000 (Revised) and ISO 14064-3:2019 for GHGemissions. The following tasks were undertaken as part of the evidence gathering process for this assurance
engagement:• Auditing the Company’s data management systems to confirm that there were no significant errors, omissions
or misstatements in the report. We did this by reviewing the effectiveness of data handling procedures,instructions and systems, including those for internal verification.
• Interviewing with those key people responsible for compiling the data and drafting the report.
• Sampling datasets and traced activity data back to aggregated levels;• Verifying the historical environmental data and records for the fiscal year 2023; and• Visiting Akatsuki Plant of Rinnai Corporation and Head Office of GASTAR Co., Ltd. to investigate whether the data
management systems have been effectively implemented.
• Conducting the remote verification to HQ of the Company for confirming the effectiveness of its data
management systems via emails and Microsoft Teams.

Observations•It is expected that the Company will continue to maintain data management systems to ensure efficient andaccurate aggregation and calculation of environmental and social data.

LRQA’s Standards, Competence and Independence
LRQA implements and maintains a comprehensive management system that meets accreditation requirements for
ISO 14065 Greenhouse gases – Requirements for greenhouse gas validation and verification bodies for use inaccreditation or other forms of recognition and ISO/IEC 17021-1 Conformity assessment – Requirements for bodies
providing audit and certification of management systems – Part1: Requirements that are at least as demanding asthe requirements of the International Standard on Quality Control 1 and comply with the Code of Ethics forProfessional Accountants issued by the International Ethics Standards Board for Accountants.
LRQA ensures the selection of appropriately qualified individuals based on their qualifications, training andexperience. The outcome of all verification and certification assessments is then internally reviewed by senior
management to ensure that the approach applied is rigorous and transparent.
This is the only work undertaken by LRQA for the Company and as such does not compromise our independence orimpartiality.
SignedDated: 19 July 2024Kazuyori Yukinaka
LRQA Lead Verifier
On behalf of LRQA Limited
10th Floor, Queen's Tower A, 2-3-1 Minatomirai, Nishi-ku, Yokohama, JAPANLRQA reference: YKA4005612
LRQA, its affiliates and subsidiaries, and their respective officers, employees or agents are, individually and collectively, referred to in this clauseas 'LRQA'. LRQA assumes no responsibility and shall not be liable to any person for any loss, damage or expense caused by reliance on theinformation or advice in this document or howsoever provided, unless that person has signed a contract with the relevant LRQA entity for theprovision of this information or advice and in that case any responsibility or liability is exclusively on the terms and conditions set out in thatcontract.
The English version of this Assurance Statement is the only valid version. LRQA assumes no responsibility for versions translated into otherlanguages.
This Assurance Statement is only valid when published with the report to which it refers. It may only be reproduced in its entirety.
Copyright © LRQA, 2024.
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Table 1. Summary of Rinnai Corporation’s GHG Emissions Inventory in FY 2023
ScopeTonnes CO2e

Direct GHG emissions (Scope 1)
Energy indirect GHG emissions (Scope 2, Market-based)
Energy indirect GHG emissions (Scope 2, Location-based)
Other indirect GHG emissions (Scope 3, Category 11)
Category 1
Category 2
Category 3
Category 4
Category 5
Category 6
Category 7
Category 8
Category 11
Category 12

34,876
63,50264,457
13,143,285
889,861
132,800
16,763
8,685
4,960
1,585
5,286
（Included in Scope 1,2）
12,075,588
7,755

Table 2. Summary of Rinnai Corporation’s Energy Consumption Data in FY2023
Electricity
Town gas
MethaneLPG
ButaneAcetylene
Ethylene
Heavy oil
Kerosene
Light oil
Gasoline

for the use of equipment in each facility
for vehicle use
for the use of equipment in each facility
for vehicle use

for the use of equipment in each facility
for vehicle use
for the use of equipment in each facility
for vehicle use

121,924.6
9,759.7
32.4
2,097.1
1.3
6.5
6.5
0.04
0.18
13.3
80.4
318.1
4.3
1,950.9

MWh103Nm3
103Nm3
103m3
tttt
t
kl
kl
kl
kl
kl
kl

438,928.6
439,285.2
1,287.7
105,065.7
64.1
322.2
323.9
2.1
7.0
486.7
3,055.2
12,087.1
145.2
65,161.2

Table 3. Summary of Rinnai Corporation’s Renewable Energy Data in FY2023
Self-owned solar power
generation

for private

for sale
Purchased renewable electricity
Carbon neutral Natural Gas
Carbon neutral LPG

Page 3 of 3

1,176.8

MWh4,236.5

GJ

355.4
1,329.5
22.0
2.5

MWh
MWh103m3t

1,279.6
4,786.3
959.1
124.2

GJ
GJ
GJ
GJ

GJ
GJ
GJ
GJ
GJ
GJ
GJ
GJ
GJ
GJ
GJ
GJ
GJ
GJ
GJ