Part 42Economizers

Part 42—Economizers

33 Prescribed activity

(a) installing on a gas-fired steam boiler, a gas‑fired hot water boiler or gas-fired water heater that is a Type B appliance (other than a condensing steam boiler, condensing hot water boiler or condensing water heater) an unlisted product that—

(i) is of the condensing type; and

(ii) complies with the criteria specified in column 2 of an item in Table 42.1; and

(iii) provides for the products of combustion to be expelled into a stack constructed from stainless steel; and

(iv) unless the product is specifically designed to run dry, has a control system for minimum flow rates that does not require manual intervention for operation; or

(b) installing on a gas-fired steam boiler that is a Type B appliance (other than a condensing water boiler or condensing water heater) an unlisted product that—

(i) is not of the condensing type; and

(ii) complies with the criteria specified in column 2 of an item in Table 42.1; and

(iii) unless the product is specifically designed to run dry, has a control system for minimum flow rates that does not require manual intervention for operation.

Table 42.1—Product categories

| 42A | An economizer that—<br> (a) is a heat exchanger that uses the products of combustion from a gas-fired steam boiler, a gas-fired hot water boiler or a gas-fired water heater to heat boiler feedwater; and<br> (b) complies with AS 1228. |

Sch. 2 Pt 43 (Heading and cl. 34) inserted by S.R. No. 97/2021 reg. 9.