Do I need a dedicated DHW line to the toilet?

Technically no — toilets almost never have hot water. The exception is a bidet or a heated hygiene shower. Then a branch is pulled from the nearest point (usually the bathroom basin).

Does a manifold pay off, or is it money down the drain?

In a 2-room apartment with 3 DHW points, a manifold is overkill. In a 3–4 room home with 5+ points and simultaneous shower use (large family), a manifold delivers daily comfort. It's a 2–3K ILS difference that lasts 20+ years.

Can I connect a washing machine to hot water?

Modern machines usually have only a cold inlet — they heat the water themselves. If you have a German/Swiss machine with a second inlet, connecting to DHW saves electricity. But feed warm, not hot (up to 50 °C), and install a check valve.

My apartment is old and the riser is galvanized. Can I keep the riser and redo the apartment side in PEX?

Yes — that's actually what most people do. The transition to PEX goes right after the apartment shut-off. Keep in mind: if the riser is on its last legs, in a few years the neighbors will replace it in a building-wide repair, and your section will be shut off during the replacement anyway.

Hot water distribution in Israel — boiler/dud shemesh layouts, materials, pricing

KABLAY

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Hot water distribution in Israel — boiler/dud shemesh layouts, materials, pricing | KABLAY