ICS 97.040.20  
 
Reference number  
DRS 290: 20 23 
© RSB 2023  
  
 RWANDA 
STANDARD  DRS 
290 
 
Third e dition  
2223 -mm-dd 
 
 
Solid biomass cookstoves — Specification  
  
RS Number:yyyy  
In order to match with technological development and to keep con tinuous progress in industries, Standards are 
subject to periodic review. Users shall ascertain that they are in possession of the latest edition  
 
© RSB yyyy 
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced  or utilized in any 
form or by any means, electronic or mechanical, including photocopying and microfilm, without prior written 
permission from RSB. 
Requests for permission to reproduce this document should be addressed toRwanda  Bureau of S tandard s. 
P.O Bo x 7099  
Kigali -Rwanda  
Tel: +250 -252- 586103/582945/ 582946  
Fax: +250 -252- 583305  
E-mail: info@RSB.org.rw  
 
 
ii Error! Reference source not found.  
   DRS 290: 20 23 
iii                ©RSB2023 - All rights reserved  
 In order to match with technological development and to keep continuous progress in industries, 
standards are subject to periodic review. Users shall ascertain that they are in possession of the latest 
edition  
 
 
 
 
 
 
 
 
© RSB2023  
All rights reserved. Unless otherwise specified, no part of this publication may be reproduced or utilized 
in any form or by any means, electronic or mechanical, including photocopying and microfilm, without 
prior written permission from R SB. 
Requests for permission to reproduce this document should be addressed to : 
Rwanda Standards  Board  
P.O Box 7099 Kigali -Rwanda  
KK 15 Rd, 49  
Tel. +250 788303492  
Toll Free: 3250  
E-mail: info@rsb.gov.rw  
Website: www.rsb.gov.rw  
ePortal: www.portal.rsb.gov.rw  
 DRS 290: 20 23 
©RSB 2023 - All rights reserved    
              iv 
 Foreword  
Rwan da Standard sareprepared by Technical Committees and approved by R wanda Standards Board (RSB) 
Board  of Directors in  accordance with the procedures of RSB, in compliance with Annex 3 of the WTO/TBT 
agreement on the preparation, adoption and application of standards.  
The main task of technical committees is to prepare national standards.  Final Draft Rwanda S tandards 
adopted by Technical committ ees are ratifie d by me mbers of RSB Board of Director s for publication and 
gazettment as Rwanda Standards.  
DRS290 was prepared by a Joint Technical Committee RSB/TC 49,Renewable energy , RSB/TC 10,Electrical 
installation and protection against electrical shock andRSB/TC 50,Electrical generation, transmission and 
distribution systems . 
In the preparation of this standard, reference was made to the following standard s: 
1) KS 1814 -1: 2005 ,Biomass stoves — Performance requirements and test methods — Part 1: Household 
biomass stoves  
2) US 761: 2007 ,Energy efficiency stoves — Household biomass stoves — Performance requirements and 
test methods  
3) ISO 19867 -1:2018 ,Clean cookstoves and clean cooking solutions — Harmonized laboratory test protocols 
— Part 1: Standard test sequence for em issions and performance, safety and durability  
4) ISO/T R 19867 -3: 2018, Clean cookstoves and clean cooking solutions — Harmonized laboratory test 
protocols — Part 3: Voluntary performance targets for cookstoves based on laboratory testing  
The assistance de rived from the above source is hereby acknowledged with thanks.  
This third edition cancels and replaces the second edition (RS  290: 2016 ), [clause s 2, 3, 4 and 6 were  revised. 
Table 1has been updated  and annex es A, B, C, D, E, F were deleted . 
Committee membership  
The following organizations were represented on the Technical Committee on Joint Technical 
Committee RSB/TC 49, Renewable energy , RSB/TC 10,Electrical installation and protection against electrical 
shock andRSB/TC 50,Electrical generation, transmi ssion and distribution systems  in the preparation of this 
standard.  
AGROPLAST  
ANCHORECO  
EGCC Ltd  DRS 290: 20 23 
v                ©RSB2023 - All rights reserved  
 Enterprise Multiservices (EMS)  
Geni Green Solutions (GGS) Ltd  
LIKANO  
Ministry of Infrastructure (MININFRA)  
Quality Engineering Company Ltd  
REDO  
REGREPOWER  
RMH  
Ruliba Clays Ltd  
Rwanda Energy Group Energy Development Corporation Ltd (REG/EDCL)  
SUN ALLIANCE  
TGS Ltd  
University of Rwanda - College of Science and Technology (UR -CST)  
Yes shop Ltd  
Rwanda Standards Board (RSB) – Secretariat  
 
 
 
 
 DRS 290: 20 23 
©RSB 2023 - All rights reserved    
              vi 
 Introduction  
This Rwanda standard is intended for use to s et performance requirements for cookstovesused primarily for 
cooking or water heating. Its purpose is to help producers and users to reduce the detrimental impact on 
environment and health of tradit ional cooking practices with the view to improve livelihood of citizens. The 
additional general des cription of ceramic liner cookstove is provided in Annex A as informative information to 
help local producers in manufacturing process.  
This standard was dev eloped to improve the quality of cookstoves on the market and was developed from 
best practices from existing cookstoves available on market which comply with minimum technical conditions 
as set by ISO and regional standards.  
 DRS 290: 20 23 
1                ©RSB2023 - All rights reserved  
 Solid biomass cookstoves — Specification  
1 Scope  
This Draft Rwanda Standard specifies requirements sampling and test methods for solid biomass cookstoves.  
The standard is applicable to cookstoves used primarily for domestic and small -scale institutional cooking or 
water heating excluding stoves used primarily for s pace heating.  
2 Normative references  
The following documents are referred to in the text in such a way that some or all of  their content constitutes 
requirements of this document.  For dated references, only the editioncited applies. For undated references, 
the latest edition of the referenced document (including any amendments) applies.  
RSISO 19867 -1, Clean cookstoves and clean cooking solutions — Harmonized laboratory test protocols — 
Part 1: Standard test sequence for emissions and performance, safety and durability  
3 Terms and definitions  
For the purposes of this standard, the follow ing terms and definitions apply.  
3.1 
cookstove  
apparatus which is used to cook food and/or provide warmth and/or boil water through the conversion of 
biomass, typically throu gh combustion  
3.2 
biomass  
material of biological origin excluding embedded in geological formations and/or fossilized  
 
3.3 
maximum cooking power  
highest cooking power for which a cookstove is designed, in kW  
3.4 
minimum cooking power   
©RSB 2023 - All rights reserved    
              2 
 lowest cooking power for which a cookstove is designed, in kW  
3.5 
organic carbon  
carbonaceous material in which the carbon is chemically bonded to hydrogen and possibly also oxygen, 
nitrogen , sulphur or other elements  
3.6 
particulate matter  
solids and liquids of a suffici ently small size to be suspended in air  
3.7 
PM2.5  
fine particulate matter such that the aerodynamic diameter of the particles is less than or equal to 2.5 μm  
3.8 
combustion efficiency  
proportion of latent heat in a fuel transferred as heat to a working fluid (water)  
3.9 
thermal efficiency  
ratio of useful energy delivered to fuel energy use d 
3.10 
Water Boiling Test  
test in which the performance of a stove is evaluated through the heating of a known quantity of water acrossa 
specified range of temp erature following a defined protocol  
3.11 
black carbon (BC)  
particulate carbonaceous material, typically the product of combustion that comprises primarily carbon  DRS 290: 20 23 
3                ©RSB2023 - All rights reserved  
 3.12 
durability  
ability of a cookstove to continue to be operated for an extended period safely and with minimal loss 
ofperformance under conditions typical of those found in the target community  
3.13 
safety  
ability of a cookstove to be operated at an acceptable level of risk of harm  
4 Requirements  
4.1 General requirements  
4.1.1  All component  parts of solid biomass cookstoves shall be made of non -corroding material or protected 
against corrosion by a suitable anticorrosion coating.  
4.1.2  The solid biomass cookstoves shall use improved technologies to yield low emissions and high level 
of effic iency, durability and safety.  
4.1.3  The solid biomass cookstoves shall be evaluated based on performance in the areas of fuel 
efficiency, emissions of fine particulate matter (PM 2.5) and carbon monoxide (CO), indoor emissions 
(particulate matter 2.5 and c arbon monoxide), black carbon content, durability and safety and each area shall 
be ranked separately.  
4.1.4  The cookstove shall be supplied with user guide in at least one of three official languages used in 
Rwanda  
4.2 Specific requirements  
4.2.1  Emissions, performance , and safety requirements  
4.2.1.1  Emissions shall be measured for the qualitative and quantitative determination of pollutant -
emitting sources to ensure that the pollution is within acceptable limits as given in Table 1.  
 
Table 1 — Requirements for cookstoves performance  
 Tier Thermal 
efficiency  
% Emissions  Safety 
(score)a Durability 
(score)b 
CO 
g/MJ  PM 2,5mg/
MJ  
©RSB 2023 - All rights reserved    
              4 
  
 
 
 
 
4.2.1.2 Cookstove performance (thermal efficiency and durability) and safety requirements shall be within 
the limits given in Table 1.  
4.2.1.3  Instruments used for measuring gaseous pollutant concentrations shall be calibrated at the beginning 
and end of each day of testing with certified calibration gases. Calibrations shall be documented.  
4.2.1.4  All cookstoves shall be at least be classified in one of the three categories given in Table 1.  
4.2.1.5  After testing, th e test report shall indicate the type of the tested cookstoves as given in Table 1.  
5 Fuel 
The solid biomass fuel shall comply with the relevant standards.  
6 Marking  
The marking shall be done either by painting or by using tags. All solid biomass cookstovessha ll be 
indeliblyand legibly marked with the following information in at least one of the three official languages used 
inRwanda and shall be placed in a c lear location on the cookstove:  
a) manufacturer’s name or trademark;  
b) batch number;  
c) country of origin;  
d) name  of the product.  Better  
Performance  
 5 ≥50 ≤3,0 ≤5 ≥95 <10 
4 ≥40 ≤4.4 ≤62 ≥86 <15 
3 ≥30 ≤7.2 ≤218  ≥77 <20 
2 ≥20 ≤11.5 ≤481  ≥68 <25 
a Safety protocols (see ISO 19867 -1:2018, Clause 7) cover solid -fuel stoves and solar cookers only  
b Durability protocols (see ISO 19867 -1:2018, Clause 8) evaluate common material failures in biomass cookstoves. The protocol is not 
comprehensive of all fail ures that might be found in the field, nor are the tests found in the durability protocol applicable for all 
cookstoves. Instead, the durability protocol seeks to cover the most prevalent durability concerns found across a range of co okstove 
technologies a nd construction materials.  DRS 290: 20 23 
 
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