How to choose a water heater: a practical guide for a master (+ checklist)

How to choose a water heater: a practical guide for a master (+ checklist)

Which boiler should you buy? A storage-type or a flow-type (tankless)? A 50-liter or a 100-liter one?

This is a guide with explanations. If you already know which boiler you need and want to calculate quickly, use the "Boiler Calculation" calculator.

I have been working in construction and renovation for over 20 years. I have done electrical work, plumbing, and tiling. Plus, I built my own house. I know: making a mistake with a boiler is expensive. If you buy a small one, there won´t be enough water. If you buy an 8 kW flow-type boiler, your wiring won´t hold up. And people often forget about allocated power capacity altogether.

I created this guide so you don´t make mistakes. Here is everything you need to know before buying: which type to choose, how to calculate volume, and how to check your wiring. No fluff and no "marketing" tales. Only what has been tested on actual jobsites.

What´s inside:

- Which type of boiler to choose – storage or flow-type. For an apartment, house, or dacha.

- How to choose the volume – a table based on the number of people and their preferences (shower or bath).

- How to choose the power – how many kW are needed for a shower, for a kitchen. Why 8 kW is the limit for an apartment.

- How to check your wiring – cable cross-section, circuit breaker rating, allocated power.

- Common mistakes – a small tank for a family, an 8 kW flow-type boiler in an old apartment, "the bigger, the better."

- Checklist – for printing before purchasing.

Who is this for:

- Plumbers and craftsmen – for selecting a boiler for clients.

- DIY enthusiasts – for themselves.

- Anyone doing a renovation.

Format: archive (Word + Word). Works in Word and Google Docs.