Needs power
Heats domestic hot water by burning gas, either on demand as the tap runs or into a stored cylinder. On-demand avoids keeping a tank hot for nothing; a cylinder copes better with several draws at once.
One of 6 ways to meet Domestic water heating. Build 3/6, Upkeep 3/6, Efficiency not rated. Cost, carbon and footprint below are rated against those 6, not in absolute terms.
A gas supply or room for a tank, and a compliant flue route
Every option in this sub-function, with the value on each axis and a note on what drives it (this solution highlighted):
| Solution | Build skill | Upkeep burden | Efficiency |
|---|---|---|---|
| Thermosiphon solar water heater | Intermediate | 3 | #1 |
| Compost-coil water pre-heater | Basic | 3 | #3 |
| Electric or heat-pump water heater | Specialist | 8 | #4 |
| Batch solar water heater (integrated collector-storage) | Intermediate | 3 | #2 |
| Wood-stove flue water heater (thermosiphon coil) | Intermediate | 4 | #2 |
| Gas water heater | Specialist | 6 | N/A |
Build skill and upkeep burden are proxies (lower burden = simpler to maintain); the efficiency column is this sub-function’s ranking, 1 = best. “N/A” where an axis isn’t rated here.
No sources recorded yet.
No build tutorial recorded yet.
No sizing or quantities: how much a technique yields, and how much a household needs, both depend on the build and the people, so the catalogue compares options rather than dimensioning them. It carries no bill of materials and no build sequence, and it is written for an oceanic, clay-soil climate (Normandy, France). Regulatory notes are indicative and need confirming locally.