---
title: "Solar Water Heater Designer: TS 1000 Software Review"
type: "article"
slug: "solar-water-heater-designer-ts-1000-software-review"
url: "http://localhost/article/solar-water-heater-designer-ts-1000-software-review/"
markdown_url: "http://localhost/article/solar-water-heater-designer-ts-1000-software-review.md"
published_at: "2026-03-13T20:34:22+00:00"
modified_at: "2026-03-13T20:34:23+00:00"
featured_image:
  url: "http://localhost/wp-content/uploads/2022/04/20230809-041332.jpg"
excerpt: "Review of 'Solar Water Heater Designer' by Tim Rossetti (Timex), a BASIC engineering program for the TS1000/TS1500. Calculates heat gain in BTU/sq ft per month, annual fuel savings, and optimal collector area based on city, angle, efficiency, and daily hot water usage. Notes shortcomings: no print routine, oversimplified efficiency model, and assumes tank size equals…"
category:
  - name: "Timelinez"
    slug: "timelinez"
    taxonomy: "category"
    url: "http://localhost/category/periodicals/timelinez/"
post_tag:
  - name: "Software review"
    slug: "software-review"
    taxonomy: "post_tag"
    url: "http://localhost/tag/software-review/"
  - name: "TS 1000"
    slug: "ts1000"
    taxonomy: "post_tag"
    url: "http://localhost/tag/ts1000/"
model:
  - name: "Timex/Sinclair 1000"
    slug: "ts-1000"
    taxonomy: "model"
    url: "http://localhost/model/ts-1000/"
indiv:
  - name: "Paul Perreault"
    slug: "paul-perreault"
    taxonomy: "indiv"
    url: "http://localhost/indiv/paul-perreault/"
publication_r:
  id: 21571
  title: "Timelinez"
  type: "periodical"
  url: "http://localhost/periodical/timelinez/"
authors_r:
  - name: "Paul Perreault"
    slug: "paul-perreault"
    taxonomy: "indiv"
    url: "http://localhost/indiv/paul-perreault/"
volume: "2"
issue: "2"
issues_articles:
  - id: 38801
    title: "Timelinez v2 n2"
    type: "issue"
    url: "http://localhost/issue/timelinez-v2-n2/"
pages: "9"
pubdate: "February 1984"
product_reviews:
  - id: 13965
    title: "Solar Water Heater Designer"
    type: "product"
    url: "http://localhost/product/solar-water-heater-designer/"
archive_link: false
---

Review of ‘[Solar Water Heater Designer](http://localhost/product/solar-water-heater-designer/)‘ by [Tim Rossetti](http://localhost/indiv/tim-rossetti/) (Timex), a BASIC engineering program for the TS1000/TS1500. Calculates heat gain in BTU/sq ft per month, annual fuel savings, and optimal collector area based on city, angle, efficiency, and daily hot water usage. Notes shortcomings: no print routine, oversimplified efficiency model, and assumes tank size equals daily usage.