Drinking water costs a Thai household of four roughly 2,000 to 4,000 baht a month in small bottles, 350 to 700 baht in delivered 20-litre bottles, and under 250 baht in filter and electricity with a point-of-use system, once the system is paid for. An office of 20 people spends nearly three times as much.
The litres are the same in every case: about 2 litres per person per day at home and 1.5 litres per person per working day at the office. What changes is the price per litre, which runs from under 1 baht to more than 15.
This guide gives you the formula, typical Thai prices to plug in, and a worked table for a home and an office. Replace our assumptions with your own receipts and the result is your real monthly cost.
How many litres does a home or an office drink per month?
Start from people, not from bottles. Health guidance in Thailand's climate is about 2 litres a day for an adult, and offices see about 1.5 litres per person per working day including tea and coffee.
| Site | People | Litres per day | Litres per month |
|---|---|---|---|
| Couple | 2 | 4 | 120 |
| Family | 4 | 8 | 240 |
| Small office (22 working days) | 10 | 15 | 330 |
| Office (22 working days) | 20 | 30 | 660 |
| Office (22 working days) | 50 | 75 | 1,650 |
Cooking, pets, visitors and a coffee machine add to this. A café or a restaurant should count water served to customers separately.
What does each option cost per litre in Thailand?
Prices vary by brand, city and supplier, so treat these as late-2026 ranges to check against your own invoices.
- Small bottles. Thai purified water in 600 ml bottles sells for about 7 to 10 baht at convenience stores, or 12 to 17 baht per litre. Mineral water brands cost about 10 to 13 baht per 500 ml, around 20 to 26 baht per litre, and imported brands several times that.
- 1.5-litre bottles. Around 13 to 20 baht each for Thai brands, or 9 to 13 baht per litre.
- Delivered 20-litre bottles. Usually 25 to 60 baht per bottle delivered in Bangkok, more on islands, which is about 1.5 to 3 baht per litre, plus a bottle deposit and the dispenser.
- Refill shop or vending machine. Often 1 baht per litre or less, with the hygiene caveats that come with an unlicensed machine and a bottle nobody cleans.
- Point-of-use system. Filters and electricity typically come to well under 1 baht per litre once the unit is bought or rented. A cooling dispenser draws about 40 to 50 W while cooling, which is a few hundred baht of electricity a month at Thai tariffs.
What does a family of four pay per month?
Take 240 litres a month and apply the ranges above.
| Option | Price per litre | Cost per month | Bottles per month |
|---|---|---|---|
| 600 ml bottles, Thai brand | 12 to 17 baht | 2,900 to 4,100 baht | 400 |
| 1.5-litre bottles | 9 to 13 baht | 2,200 to 3,100 baht | 160 |
| 20-litre delivered | 1.5 to 3 baht | 360 to 720 baht | 12 |
| Point-of-use system | Under 1 baht | Under 240 baht, plus the system | 0 |
Most families mix options: a dispenser for the kitchen and small bottles for the car and school. The mix is what makes the real figure hard to see, which is why a month of keeping receipts is worth doing before you change anything.
What does an office of 20 people pay per month?
Take 660 litres a month, 22 working days.
| Option | Cost per month | What it also costs |
|---|---|---|
| Small bottles for staff and visitors | 8,000 to 11,000 baht | Storage, chilling, 1,100 empties |
| 20-litre delivered, 35 bottles | 900 to 2,100 baht | Someone to receive and lift 19 kg bottles, deposits, dispenser cleaning |
| Point-of-use system | Filters and electricity, under 700 baht | Purchase or rental of the unit |
For an office the bottle price is rarely the largest line. Staff time, missed deliveries and the space taken by full and empty bottles usually cost more than the water. Our guide to choosing an office water dispenser walks through those items.
How do you compare a system against bottles honestly?
- Count your litres per month from the table above, or from three months of invoices.
- Multiply by your real price per litre, delivery included.
- Add the hidden items: deposits, storage space, staff time, dispenser cleaning, fuel for trips to the shop.
- For a system, add the filter schedule and the electricity, then divide the purchase price over its expected life, or use the monthly rental.
- Compare the two monthly totals and the number of bottles each produces.
Prices for home systems are listed on our online shop, and business pricing follows a site visit because the right size depends on your water and your headcount. Our rental page explains the monthly option for offices and shops, and the bottle calculator shows how many bottles your site gets through in a year.
Does water from air cost more to run than a filter?
An atmospheric water generator uses electricity to condense water from humid air, so its running cost is higher per litre than a filter on a water line, and it depends on humidity and temperature. In return it needs no plumbing and no delivery, which is why it suits islands, villas and sites with poor mains water. The Air range page gives the average daily outputs; the right comparison is against the bottles it replaces, not against tap water.
Frequently asked questions.
How much drinking water does a person use per month?
About 60 litres at home, at 2 litres a day, and about 33 litres at the office over 22 working days at 1.5 litres a day. Hot work and sport push the figure up.
What is the cheapest way to get drinking water in Thailand?
Per litre, refill shops and point-of-use filters are the cheapest, followed by delivered 20-litre bottles. Small bottles cost five to ten times more per litre than any of these.
How much does a 20-litre water bottle cost in Bangkok?
Typically 25 to 60 baht delivered, depending on the brand and the area, plus a one-time deposit on the bottle. Island prices are higher because the water travels by ferry.
How much electricity does a water dispenser use?
A hot and cold unit draws about 40 to 50 W while cooling and more while heating, which comes to a few hundred baht a month in a Thai office. Switching the heater off at night cuts this.
Is a water system worth it for a small household?
For a couple drinking 120 litres a month, the saving against small bottles is large and against delivered bottles modest. Convenience and the end of plastic waste usually decide it rather than the money.
Home systems and their prices are on our online shop. For an office, a café or a hotel, request a site assessment and we will size the system and give you the monthly figure to compare.
