NZ community-scale hot-water storage tank cost (2026 web synthesis)
Advances RT_003 — the community-scale shared-tank $/L CR_038 left open
CR_038 sourced the household side; this fills the large-tank ($/L) figure. The premium duplex-SS DHW side has a fetchable listed primary (refrigeration.nz); the cheaper plain hydronic buffer/thermal-store tanks — the type a shared community store would actually use — remain price-on-application, so RT_003 stays partly open. AI-prepared → data_quality medium.
Summary
Per-litre cost of large (300–1000+ L) shared hot-water storage. Premium duplex-stainless DHW cylinders are NZ-published and fetchable: 500 L = NZD 7,671.82 (~15.3/L), 615 L = NZD 8,811.81 (~14.3/L) from Hot Water Heat Pumps Ltd (refrigeration.nz), NZ-built and heat-pump-compatible with a 5 kW backup element — per-litre cost declines with capacity (storage scale economy). These are unit prices only (excl. install, fittings, coils, freight) and GST status is unstated. Plain mild-steel / glass-lined hydronic buffer/thermal-store tanks (Central Heating NZ TS-series, Cooke Industries, Rinnai/Rheem commercial) are cheaper per litre but all price-on-application — no NZ published price was found, roughly ~NZD 6–10/L (unconfirmed). Defensible model assumptions: ~NZD 14–16/L premium SS DHW storage; ~NZD 6–10/L plain hydronic buffer (provisional, flag for a vendor quote).
Key claims
- claim: "PREMIUM DUPLEX-SS DHW STORAGE CYLINDERS (NZ-published, fetchable primary). 500 L = NZD 7,671.82 (~15.3/L); 615 L = NZD 8,811.81 (~14.3/L) — Hot Water Heat Pumps Ltd (refrigeration.nz), 'designed and built in NZ', heat-pump-compatible with 5 kW backup element. Per-litre cost DECLINES with capacity (storage scale economy). Unit price only (excl. install, fittings, coils, freight); GST status not stated (NZ e-commerce usually GST-incl, so ~12.5–13.3/L ex-GST if so)."
source_location: "refrigeration.nz product listings (Hot Water Heat Pumps Ltd) — 500 L & 615 L duplex SS cylinders; headline prices spot-confirmed by direct page fetch per retrieval provenance"
- claim: "PLAIN HYDRONIC BUFFER / THERMAL-STORE TANKS — cheaper but unpriced. Plain mild-steel / glass-lined buffer/thermal-store tanks (Central Heating NZ TS-series e.g. TS500/TS1000; Cooke Industries bespoke 100–10,000 L SS; Rinnai/Rheem commercial 800/1000 L) are cheaper per litre than premium SS DHW cylinders but all price-on-application — no NZ published price found. Rough estimate ~NZD 6–10/L, UNCONFIRMED (needs a vendor quote). No confirmed 1000 L+ price; scale economy implies <14/L but unverified."
source_location: "Central Heating NZ / Cooke Industries / Rinnai NZ product pages (all POA); estimate stated as provisional in the synthesis"Neobiome Intelligence relevance
Advances RT_003 — the community shared hot-water-storage $/L that the household-scale CR_038 left open — feeding the D01 heat / hot-water-storage cost cell. Two figures for two tank types: for a shared community DHW cylinder, the fetchable SS primary gives ~14–15/L (declining with size); for a shared hydronic buffer / thermal store (the cheaper tank a community heat loop would actually use), only a provisional ~NZD 6–10/L exists. So RT_003 stays partly open for a plain buffer-tank vendor quote — that is the figure the model most needs. The SS prices should be re-fetched from refrigeration.nz before landing in a live model cell (the listing is a fetchable primary). See D01.
Retrieval provenance
AI-prepared via WebSearch + WebFetch, 2026-06-20; verdict “confirmed, hallucination risk low — headline prices spot-confirmed by direct page fetch.” The SS cylinder prices are from a fetchable listed primary (refrigeration.nz) — strongest. The plain buffer-tank ~NZD 6–10/L is an unconfirmed estimate (all vendors POA) — weakest. Values AI-extracted; re-confirm against the live listing before applying to a model cell.
Research targets
Research gaps
- RT_003 stays partly open: a plain hydronic buffer / thermal-store tank vendor quote ($/L for the cheaper community-store tank type) — Cooke / Central Heating NZ / Rinnai are all price-on-application. The premium-SS side is now sourced.
Connections
Links to
EDT domains (1): D01: Renewable Energy & Storage Systems
Sources (1): CR_038
Referenced by
EDT domains (1): D01: Renewable Energy & Storage Systems